Prescription Drug DUI

A prescription drug DUI in Colorado can be charged even when the medication was legally prescribed, taken for a legitimate medical condition, and possessed lawfully. Colorado’s impaired-driving laws apply to alcohol, illegal drugs, marijuana, prescription medications, over-the-counter medications, and combinations of substances when the state claims they affected a person’s ability to drive safely. Colorado’s own impaired-driving materials specifically warn that having a prescription does not prevent a DUI prosecution if the medication causes impairment.

Prescription drug DUI cases can be particularly difficult because there is usually no simple numerical threshold comparable to the 0.08 BAC standard used in alcohol DUI per se cases. Instead, prosecutors may rely on the driver’s behavior, physical appearance, statements, field sobriety exercises, blood or urine testing, medical history, medication levels, and opinions from officers trained in drug-impaired-driving investigations. Colorado law enforcement uses Advanced Roadside Impaired Driving Enforcement training and Drug Recognition Experts to investigate suspected impairment from prescription medications and other drugs.

The presence of a medication in a person’s blood does not necessarily answer the most important question: whether that medication actually impaired the person at the time of driving. Therapeutic use, dosage, tolerance, timing, interactions with other medications, medical conditions, fatigue, and individual metabolism can all become important in determining whether the prosecution can prove DUI or DWAI beyond a reasonable doubt.

Denver Prescription Drug DUI Defense Attorney

A prescription drug DUI can be more scientifically complicated than an ordinary alcohol DUI. An officer may believe that slowed speech, poor balance, drowsiness, unusual pupils, confusion, or delayed reactions demonstrate drug impairment, while those same observations may be explained by the defendant’s medical condition, fatigue, injury, prescribed treatment, anxiety, or other factors unrelated to unsafe driving.

At the Law Office of Matthew A. Martin, P.C., we understand that the existence of a prescription is only one piece of the case. Matthew Martin carefully reviews the traffic stop, body-camera footage, roadside testing, Drug Recognition Expert evaluation, blood or urine results, medical records, prescription information, toxicology evidence, and the prosecution’s theory about how the medication allegedly affected the client.

We also examine whether law enforcement improperly treated the mere presence of a prescription medication as proof of impairment. Colorado allows prescription drug DUI prosecutions, but prosecutors still must prove the statutory level of impairment required for DUI or DWAI. A lawful prescription does not automatically excuse impaired driving, but neither does a positive toxicology result automatically establish guilt.

If you have been charged with prescription drug DUI in Denver, call (303) 725-0017 or fill out an online consultation form to schedule your free consultation today.

Overview of Prescription DUI Charges in Denver, Colorado

Back to top

What Is Prescription Drug DUI Under Colorado Law?

Prescription medication cases are prosecuted under the same impaired-driving statute that governs alcohol and other drug-related DUI allegations.

Colorado recognizes DUI when a person drives after consuming alcohol, one or more drugs, or a combination of substances to a degree that makes the person substantially incapable of exercising clear judgment, sufficient physical control, or due care in operating a vehicle. DWAI applies when alcohol or drugs affect the person to the slightest degree so that the person is less able than ordinarily capable of exercising clear judgment, sufficient physical control, or due care. Colorado’s current DUI framework applies those definitions to drug-related driving as well as alcohol-related driving.

A prescription drug does not have to be illegal for it to support a DUI charge. CDOT expressly states that Colorado’s expressed-consent system applies when an officer suspects impairment from alcohol or drugs, including prescription medications. No DUI Colorado likewise warns that having a prescription does not mean the medication cannot impair driving or lead to DUI.

The central issue is therefore not simply whether the defendant was allowed to possess or use the medication. The question is whether the state can prove that the medication affected the defendant to the degree required by the DUI or DWAI statute while the person was driving.

Back to top

A Valid Prescription Is Not an Automatic Defense

One of the most common misunderstandings about prescription drug DUI is that a valid prescription makes the driving lawful. It does not.

Colorado treats lawful use and driving impairment as separate questions. A person may have been completely entitled to possess and take a medication but still face DUI if prosecutors claim the medication impaired the ability to operate a vehicle safely. State impaired-driving resources specifically caution drivers that prescription and over-the-counter medications can result in DUI when they cause impairment.

However, the fact that a person took prescribed medication also does not automatically establish impairment. Some medications remain detectable after their most significant effects have passed. Other patients develop tolerance after taking the same medication for extended periods. The concentration appearing in a blood test may be consistent with therapeutic use rather than abuse, and different people may respond differently to the same dose.

The defense may therefore focus on the distinction between drug presence and drug impairment. That difference is often one of the most important issues in a prescription drug DUI prosecution.

Back to top

Common Prescription Medications in Colorado DUI Investigations

Prescription drug DUI cases can involve many different medications. The legal question is not determined solely by the category of the drug, but certain medications are more likely than others to produce effects officers may associate with impaired driving.

Prescription Opioids — Medications containing oxycodone, hydrocodone, morphine, codeine, fentanyl, and similar drugs may cause drowsiness, slowed reactions, dizziness, or impaired coordination in some people. A positive blood test can lead investigators to allege impairment, particularly where an officer also claims to have observed lethargy or slow responses.

Benzodiazepines — Medications such as alprazolam, diazepam, clonazepam, and lorazepam can become the focus of DUI investigations because they may cause sedation, slowed response time, or coordination problems. The effects can become more significant when combined with alcohol, opioids, or other central nervous system depressants.

Sleep Medications — Drugs used for insomnia can create particular DUI concerns when a person drives too soon after taking them or experiences residual effects the following morning. No DUI Colorado specifically notes that medications containing zolpidem, particularly extended-release formulations, may affect driving ability the next morning.

Muscle Relaxants — Certain muscle relaxants may cause drowsiness, dizziness, or slowed reactions. Officers sometimes treat these symptoms as evidence of intoxication even when the person has taken the medication exactly as prescribed.

Antidepressants and Psychiatric Medications — Some psychiatric medications may cause sedation, dizziness, blurred vision, slowed thinking, or other side effects, particularly when treatment first begins or the dosage changes. The existence of such side effects does not necessarily prove that they affected the defendant during the particular driving event.

Stimulants — Prescription stimulants can also become part of DUI investigations. Prosecutors may allege impairment based on behavioral observations, dosage, combinations with other substances, or claimed overuse. A positive test alone does not necessarily establish that the person was incapable of driving safely.

Multiple Medications or Alcohol Combined With Medication — Poly-drug cases can be particularly complicated. CDOT warns that combining substances may increase impairment, and that concept applies to prescription medications as well as alcohol and other drugs.

Back to top

How Prescription Drug DUI Investigations Begin

Many prescription drug DUI cases begin with an ordinary traffic stop. An officer may stop a vehicle for alleged weaving, speeding, failure to maintain a lane, an equipment violation, or another traffic offense and then begin investigating possible impairment.

In other cases, the investigation begins after a crash. Emergency medical treatment can complicate the situation because the defendant may be injured, exhausted, medicated by paramedics or hospital staff, or experiencing symptoms that officers later describe as evidence of impairment.

Once the officer suspects drugs rather than alcohol, the investigation may shift toward questions about medications, prescriptions, medical conditions, dosage, and when the defendant last took the drug. Statements made during this stage can become important evidence because prosecutors may later attempt to use the defendant’s own description of medication use to construct a timeline of alleged impairment.

Officers may also request assistance from a Drug Recognition Expert. CDOT describes DREs as officers specially trained to recognize signs associated with impairment from drugs other than, or in addition to, alcohol. Officers may also receive ARIDE training designed to identify possible drug impairment during roadside investigations.

Back to top

Drug Recognition Expert Evaluations

Drug Recognition Expert evaluations are often treated as important evidence in prescription drug DUI cases, but they are not laboratory tests and should not automatically be treated as scientific proof of impairment.

A DRE may evaluate physical appearance, eye movements, pulse, blood pressure, body temperature, coordination, muscle tone, pupil size, statements, and other observations before forming an opinion about whether drugs may be affecting the person.

Many of these observations can have alternative explanations. Anxiety can increase pulse and blood pressure. Fatigue can cause drooping eyelids or slow responses. Prescription medication may alter pupil size without producing unsafe driving impairment. Medical conditions, injuries, neurological disorders, dehydration, and stress can affect balance and coordination.

The defense can compare the DRE’s conclusions with body-camera footage, medical records, toxicology results, prescription history, driving behavior, and other objective evidence. An officer’s opinion is evidence, but it does not eliminate the prosecution’s burden to prove impairment beyond a reasonable doubt.

Back to top

Blood and Urine Testing in Prescription Drug DUI Cases

Drug DUI investigations frequently involve blood testing because breath testing is primarily designed to measure alcohol rather than prescription medication.

Colorado’s expressed-consent framework applies when an officer has the necessary grounds to believe a driver is impaired by drugs. CDOT states that drivers arrested on suspicion of impairment from alcohol or drugs, including prescription medications, are subject to Colorado’s toxicology-testing requirements.

A blood test may identify one or more medications and provide concentrations measured by the laboratory. But interpreting those numbers can be considerably more complicated than interpreting an alcohol concentration.

For many prescription drugs, Colorado does not establish a single numerical concentration that automatically proves DUI. A therapeutic concentration for one person may have a different effect on another. The relationship between blood concentration and driving impairment may depend on dosage, tolerance, metabolism, time since ingestion, other medications, and the particular pharmacology of the drug.

Urine testing can create additional limitations because the presence of a drug or metabolite in urine may demonstrate prior exposure without necessarily identifying how impaired the person was at the time of driving. Defense counsel may challenge whether the test meaningfully answers the question the prosecution is required to prove.

Back to top

Therapeutic Levels Versus Impairment

A laboratory report may classify a concentration as therapeutic, toxic, or otherwise within a reference range. Those labels can be useful, but they do not necessarily determine whether a person was legally impaired while driving.

Someone who has taken the same prescription medication for months or years may develop significant tolerance to effects that would strongly affect a first-time user. Conversely, a person beginning a new medication or increasing a dosage may experience more substantial side effects even at an ordinary therapeutic level.

The prosecution may attempt to combine the blood concentration with officer observations to establish impairment. The defense may counter with medical records, prescribing information, pharmacy records, toxicology expertise, and evidence showing that the defendant’s observed behavior was inconsistent with significant drug impairment.

Prescription drug DUI cases therefore often require more individualized analysis than alcohol DUI cases because the significance of the concentration cannot always be reduced to one statutory number.

Back to top

Prescription Drugs Combined With Alcohol

A person can face DUI based on a combination of alcohol and prescription medication even when neither substance alone appears sufficient to explain the alleged impairment.

Colorado DUI law covers combinations of alcohol and drugs, and CDOT specifically warns that using multiple impairing substances may intensify the effects of each.

These cases may involve a BAC below 0.08 combined with a sedative, opioid, sleep aid, muscle relaxant, or other medication. Prosecutors may argue that the combined effects made the driver substantially incapable of safely operating the vehicle even though the alcohol concentration alone would not support DUI per se.

The defense should examine whether there is reliable evidence of an actual interaction rather than allowing the government to assume that the mere presence of two substances proves enhanced impairment. Dose, concentration, timing, tolerance, and observed behavior all remain relevant.

Back to top

Criminal Penalties for Prescription Drug DUI in Colorado

Colorado generally applies the same criminal DUI and DWAI sentencing ranges whether the alleged impairment resulted from alcohol, prescription medication, another drug, or a combination of substances. The exact sentence depends on the offense, prior record, and other circumstances. Colorado’s current statewide DUI law summary confirms that drug- and alcohol-related DUI offenses operate within the same general sentencing framework.

First DUI — A first DUI generally carries 5 days to 1 year in county jail, a fine of $600 to $1,000, and 48 to 96 hours of useful public service. The court may also impose up to 2 years of probation, together with alcohol and drug evaluation, education, treatment, and other conditions.

First DWAI — A first DWAI generally carries 2 days to 180 days in county jail, a fine of $200 to $500, and 24 to 48 hours of useful public service.

Second DUI, DUI Per Se, or DWAI — A person with one qualifying prior generally faces 10 consecutive days to 1 year in county jail, a fine of $600 to $1,500, 48 to 120 hours of useful public service, and at least 2 years of probation.

Third DUI, DUI Per Se, or DWAI — A person with two qualifying prior convictions generally faces 60 consecutive days to 1 year in county jail, a fine of $600 to $1,500, 48 to 120 hours of useful public service, and at least 2 years of probation.

Felony DUI — DUI, DUI per se, or DWAI can become a class 4 felony after the statutory number of qualifying prior convictions arising from separate criminal episodes. A class 4 felony generally exposes the defendant to 2 to 6 years in prison, a possible fine of $2,000 to $500,000, and 3 years of mandatory parole, subject to Colorado’s felony DUI sentencing provisions and possible probation alternatives.

Drug-related DUI cases may also result in evaluation and treatment requirements that focus specifically on alcohol and drug use. The Colorado Judicial Branch currently lists separate alcohol- and drug-related traffic fees, including an alcohol/drug evaluation fee and related surcharges, in addition to the principal sentence.

Back to top

Driver’s License Consequences of Prescription Drug DUI

The driver’s license consequences of prescription drug DUI require separate attention because Colorado’s DMV process operates independently from the criminal prosecution. Colorado DMV explains that the administrative process and criminal court process are separate paths with their own requirements.

Colorado DMV currently states that one alcohol- or drug-related conviction can result in a nine-month revocation, while two alcohol- or drug-related convictions within five years can produce a one-year revocation and three or more lifetime alcohol- or drug-related convictions can produce a two-year revocation. The precise restraint depends on the nature and history of the convictions.

Colorado DMV also identifies a separate one-year revocation for a conviction involving driving under the influence of certain qualifying controlled substances or while a habitual user of such a controlled substance. Because prescription medications differ in their classification and the legal theory used in the case, the exact DMV consequence should be determined from the conviction and the defendant’s driving record.

A refusal of legally required toxicology testing creates additional consequences regardless of whether the investigation concerns prescription medication. Colorado DMV states that a first refusal results in a one-year revocation and Persistent Drunk Driver designation.

Back to top

Express Consent and Prescription Drug DUI Testing

Colorado’s expressed consent rules apply to suspected drug impairment as well as alcohol impairment. CDOT states that by driving in Colorado, motorists agree to provide toxicology testing following an arrest when an officer has probable cause to believe they are impaired by alcohol or drugs, specifically including prescription medications.

The type of test and the precise legal procedure depend on the circumstances. Drug investigations commonly involve blood testing because prescription medications cannot generally be evaluated through the same evidential breath-testing process used for alcohol.

Refusing testing does not necessarily prevent the criminal prosecution. Officers and prosecutors may rely on driving behavior, field sobriety evidence, DRE observations, statements, medical evidence, and other circumstances. The refusal itself can also produce substantial DMV consequences. Colorado DMV currently states that a first refusal causes a one-year revocation and Persistent Drunk Driver designation.

A refusal allegation may nevertheless be challengeable when the defendant did not actually refuse, could not physically complete the requested test, misunderstood the instruction, was injured, or was not given a legally sufficient opportunity to cooperate.

Back to top

Defenses to Prescription Drug DUI Charges

The Medication Was Present but Did Not Cause Impairment — This is often the central defense in prescription drug DUI cases. A laboratory result can prove that a substance was detected without establishing that it affected the defendant enough to satisfy DUI or DWAI. The defense may compare the concentration with therapeutic use, prescription history, tolerance, driving behavior, and objective video evidence.

The Defendant Took the Medication as Prescribed — Lawful use is not automatically a complete defense, but it can provide important context. A defendant who took an ordinary prescribed dose according to medical instructions presents a very different evidentiary situation from someone accused of taking excessive quantities or combining drugs recreationally.

The Officer Mistook a Medical Condition for Impairment — Diabetes, neurological disorders, fatigue, anxiety, head injuries, balance disorders, pain, illness, and other medical conditions may create symptoms that resemble drug impairment. Medical records and expert testimony may provide alternative explanations for what the officer observed.

Long Work Hours or Fatigue Explained the Symptoms — Drowsiness, slow speech, red eyes, difficulty concentrating, and delayed responses may result from sleep deprivation rather than prescription medication. This can be particularly significant where body-camera footage and driving evidence do not show substantial impairment.

The Drug Recognition Evaluation Was Unreliable — DRE conclusions are based in significant part on observations and interpretation. The defense may challenge whether the officer followed proper procedures, whether the observations actually supported the drug category identified, and whether other medical or environmental explanations were overlooked.

Field Sobriety Testing Was Unreliable — Roadside exercises can be affected by injuries, footwear, uneven pavement, poor lighting, weather, nervousness, fatigue, age, or medical problems. Performance should be examined through video rather than relying exclusively on the officer’s written interpretation.

The Blood Test Did Not Prove Impairment — Unlike alcohol DUI per se, many prescription medications do not have a statutory concentration at which guilt automatically follows. The defense can challenge the prosecution’s attempt to convert a toxicology number into a conclusion about driving ability.

The Blood Sample Was Improperly Collected or Handled — Collection technique, storage, labeling, chain of custody, laboratory procedures, instrument performance, and documentation may all affect the reliability of toxicology evidence.

The Medication Was Administered After the Driving Ended — Crash cases can involve medications administered by paramedics or hospital personnel after the accident. Medical records and collection timing can be critical to determining whether a detected substance was actually in the defendant’s system while driving.

The Defendant Was Not Driving — The prosecution must prove operation or driving. Cases involving parked cars, crashes with multiple occupants, or disputed driver identity may present a separate defense regardless of toxicology.

The Stop or Arrest Was Unlawful — A prescription drug allegation does not eliminate constitutional protections. Law enforcement must still have legally sufficient grounds for the stop, continued detention, arrest, and evidence collection.

Back to top

Role of a Colorado Prescription Drug DUI Defense Attorney

Analyzing the Prescription and Medical History — Defense counsel can obtain records showing when the medication was prescribed, the dosage, length of use, medical condition being treated, and whether the defendant had been taking the medication consistently. Those facts can be essential when evaluating tolerance and therapeutic use.

Reviewing the Toxicology Evidence — A laboratory report should not be treated as the end of the inquiry. Counsel can review the underlying toxicology records, testing methodology, concentrations, chain of custody, quality-control materials, and interpretation of the results.

Consulting Toxicology Experts — Prescription drug cases may require expert analysis of pharmacology, metabolism, therapeutic ranges, tolerance, drug interactions, and the relationship between concentration and impairment. Expert testimony can be particularly important where prosecutors rely heavily on a numerical laboratory result.

Challenging DRE Testimony — The defense can compare the officer’s conclusions with the toxicology report, video evidence, medical records, and the defendant’s actual driving. An officer who predicted one category of drug while the laboratory found another may face important credibility and reliability questions.

Reviewing Body-Camera Footage — Video may show that the defendant spoke clearly, followed instructions, walked normally, understood questions, and appeared substantially less impaired than the report suggests. In many drug DUI cases, video becomes one of the strongest sources of objective evidence.

Separating Medication Side Effects From Criminal Impairment — A medication can have known side effects without proving that a particular person was impaired while driving. Defense counsel works to prevent prosecutors from substituting general pharmaceutical warnings for individualized proof.

Addressing the DMV Case — Drug-related DUI convictions and refusals can create independent license consequences. Defense counsel should determine which DMV restraint actually applies and address any administrative hearing or reinstatement requirements without assuming the rules are identical to a standard BAC case.

Negotiating or Preparing for Trial — Where the evidence is weak, defense counsel may seek dismissal, reduction to DWAI or another offense, suppression, or another favorable resolution. If no acceptable resolution is available, the defense must be prepared to challenge the officers, toxicologists, and prosecution experts before a jury.

Back to top

Key Elements the Prosecution Must Prove

For a prescription drug DUI, prosecutors generally must establish that the defendant drove a vehicle and was under the influence of one or more drugs, or a combination of drugs and alcohol, to the degree required by Colorado law. For DWAI, the prosecution must prove the lesser statutory level of impairment. Colorado treats drug-based DUI and DWAI within the same broader impaired-driving framework as alcohol cases.

The state therefore cannot satisfy its burden merely by proving:

  • that the defendant possessed a prescription;
  • that the defendant took medication;
  • that the medication appeared in a blood or urine test; or
  • that the medication is capable of producing drowsiness or other side effects.

Those facts may be evidence, but the prosecution must connect them to the defendant’s actual condition while driving and prove the charged impairment standard beyond a reasonable doubt.

Back to top

Frequently Asked Questions About Prescription Drug DUI in Colorado

Can I get a DUI for medication my doctor prescribed?
Yes. Colorado impaired-driving laws apply to prescription medication when the state claims it caused impairment. A valid prescription does not automatically prevent DUI charges.

Does having a prescription help my defense?
It can provide important evidence that the medication was lawfully and therapeutically used, but lawful use alone does not defeat a DUI charge. The more important question is whether the medication actually impaired driving.

Is there a legal limit for prescription drugs like there is for alcohol?
Generally, there is no single 0.08-style threshold covering ordinary prescription medications. Drug DUI cases often depend more heavily on toxicology interpretation and observational evidence.

Can I be convicted just because a drug was found in my blood?
Not automatically. The prosecution still must prove the impairment required by the charged offense. Drug presence and driving impairment are related but not identical concepts.

What if my blood level was within the therapeutic range?
That can be important evidence for the defense, although it does not automatically resolve the case. Prosecutors may still rely on behavioral evidence, while the defense can argue that the concentration was consistent with prescribed treatment rather than unsafe impairment.

What if I have taken the medication for years?
Long-term use and tolerance may be important. A person who has regularly taken the same dosage may respond differently from someone who took the medication for the first time. Toxicologists may evaluate tolerance when interpreting the evidence.

Can prescription drugs combined with alcohol result in DUI?
Yes. Colorado law permits DUI prosecution based on combinations of substances, and CDOT warns that using multiple impairing substances can intensify their effects.

Can over-the-counter medication cause DUI too?
Yes. Colorado’s impaired-driving framework is not limited to prescription medications. No DUI Colorado specifically warns that common sleep, cold, allergy, and other medications can produce side effects affecting driving.

What happens if I refuse a blood test?
A first qualifying refusal generally results in a one-year driver’s license revocation and Persistent Drunk Driver designation, even where the suspected impairment involves drugs.

Can I lose my license for prescription drug DUI?
Yes. Colorado DMV imposes restraints for alcohol- and drug-related convictions, and some controlled-substance DUI convictions carry separate one-year revocation provisions. The exact restraint depends on the conviction and driving history.

Do police use Drug Recognition Experts in prescription drug cases?
Yes. Colorado uses officers trained as DREs and ARIDE officers to investigate suspected impairment from drugs, including prescription medications.

Can prescription drug DUI become a felony?
Yes, if the defendant has the qualifying prior impaired-driving convictions required under Colorado’s felony DUI law. A serious crash may also lead to separate felony charges such as vehicular assault or vehicular homicide depending on the facts.

Back to top

Denver County Court Bond Information for Prescription Drug DUI

A person arrested for prescription drug DUI in Denver may have to address bond before the case is resolved. Denver County Court publishes a Criminal Bond Schedule effective February 20, 2025. The schedule expressly addresses DUI and DWAI under C.R.S. § 42-4-1301.

DUI With No Prior DUI or DWAI — Denver County Court currently lists DUI with no prior DUI or DWAI at a $1,500 personal recognizance bond. The schedule does not distinguish between alcohol DUI and drug DUI for this entry because both are prosecuted under C.R.S. § 42-4-1301.

DUI With a Prior DUI or DWAI — When the defendant has a prior DUI or DWAI, Denver County Court provides that bond is to be set by a judicial officer at the first appearance rather than through the standard $1,500 PR bond.

DWAI With No Prior DUI or DWAI — A first qualifying DWAI is likewise listed at a $1,500 PR bond. DWAI with a prior DUI or DWAI requires an individualized bond determination by a judicial officer.

A personal recognizance bond is a signature-based release and generally does not require money or property to be deposited as long as the defendant complies with the bond and appears for future court proceedings. Denver County Court’s public bonding portal explains that additional conditions may nevertheless be imposed.

Denver County Court also states that when a defendant has one or more prior qualifying convictions under Colorado’s DUI statute or comparable out-of-state offenses, the court must order monitored sobriety as a condition of bond pursuant to C.R.S. § 16-4-105(6)(a). This can apply even though the new allegation involves prescription drugs rather than alcohol because the bond rule is tied to the defendant’s qualifying impaired-driving history.

More serious accompanying charges, including vehicular assault, vehicular homicide, child abuse, or felony allegations, can change the bond process and may require a different judicial determination.

Back to top

Additional Resources

Colorado General Assembly – Colorado Drunk Driving Laws — The Office of Legislative Legal Services publishes this statewide overview of Colorado DUI and DWAI law. The current published summary is dated October 28, 2025 and provides a useful starting point for understanding drug-related DUI, sentencing, testing, repeat offenses, and administrative consequences.

Colorado General Assembly – Colorado Revised Statutes — The Colorado General Assembly provides access to the current Colorado Revised Statutes, including C.R.S. § 42-4-1301 governing DUI and DWAI and C.R.S. § 42-4-1301.1 governing expressed consent. This is the best starting point for reviewing the actual statutory language prosecutors must use in a prescription drug DUI case.

Denver County Court – Criminal Division — A misdemeanor prescription drug DUI or DWAI filed in Denver proceeds through the criminal side of Denver County Court. This resource helps defendants understand where the local court case proceeds, while the Colorado DMV separately handles administrative license consequences.

Denver County Court – Traffic Division — Denver’s Traffic Division handles ordinary traffic matters, while DUI cases are handled through the criminal process. This distinction can be useful when a prescription drug DUI arrest also produces separate traffic citations arising from the same stop.

Denver County Court – Bonding & Warrants — Denver County Court’s current criminal bond schedule is effective February 20, 2025 and lists $1,500 PR bonds for DUI and DWAI with no priors, while cases involving prior DUI or DWAI convictions require bond to be set by a judicial officer. It also explains monitored-sobriety requirements for qualifying repeat impaired-driving defendants.

Denver County Court – Public Portal — The Public Portal allows Denver defendants to search case information, scheduled court dates, charges, sentences, fines and costs, bonds posted, and courtroom calendars. It can be useful for keeping track of a prescription drug DUI case after the summons, arrest, or bond proceeding.

Colorado DMV – The DUI Process — This official DMV page explains that a Colorado DUI creates two separate proceedings: the criminal court process and the administrative driver’s license process. Each operates on its own timeline, making this resource especially important for prescription drug DUI defendants who may incorrectly assume that winning the criminal case automatically resolves the license issue.

Colorado DMV – Reinstatement Frequently Asked Questions — This page provides detailed information about license restraints associated with alcohol- and drug-related convictions. It explains the nine-month restraint associated with one alcohol or drug conviction, increased periods for multiple convictions, and the separate one-year revocation applicable to certain controlled-substance DUI convictions.

Colorado DMV – Alcohol DUI and Express Consent — Although titled “Alcohol DUI,” this DMV resource also explains that Colorado’s chemical-testing requirements apply when officers suspect impairment from alcohol or drugs. It discusses refusal consequences, including the first-refusal one-year revocation and Persistent Drunk Driver designation.

Colorado Department of Transportation – Expressed Consent Law — CDOT specifically identifies prescription medications among the substances covered when officers have probable cause to suspect impaired driving. This page is especially useful for understanding why legally prescribed medication can still lead to post-arrest toxicology testing and why refusing that testing can create separate consequences.

Colorado Department of Transportation – Impaired Driving — CDOT provides statewide information about alcohol, cannabis, drugs, poly-drug impairment, DUI enforcement, and law-enforcement training. Its current materials note that Colorado screens impaired-driving cases for multiple substances and uses ARIDE-trained officers and Drug Recognition Experts in drug investigations.

CDOT – How Law Enforcement Detects Drug Impairment — This resource explains the role of Drug Recognition Experts and ARIDE-trained officers. CDOT specifically states that officers can arrest drivers they believe are impaired by prescription medications as well as alcohol, marijuana, and illegal drugs, making this a particularly relevant resource for prescription drug DUI cases.

No DUI Colorado – Prescription Drugs, Over-the-Counter Medications and Driving — This Colorado impaired-driving education site addresses prescription medications directly. It discusses medication warnings, driving-related side effects, mixing medications with alcohol, and examples such as sleep medications that can continue affecting driving the following morning.

No DUI Colorado – DMV Process — The site specifically warns that having a prescription does not mean a drug cannot impair driving or result in DUI. It also explains common DMV reinstatement requirements, including revocation, interlock, SR-22 insurance, fees, and alcohol and drug education and treatment.

No DUI Colorado – About the Program — No DUI Colorado was developed by Colorado’s Persistent Drunk Driver Committee as an educational resource concerning impaired driving and substance-abuse behavior. That makes it particularly useful for defendants seeking Colorado-focused explanations of drug DUI, court consequences, DMV actions, and treatment.

National College for DUI Defense – Colorado DUI Laws — NCDD’s Colorado overview explains that Colorado’s DUI statute covers drugs as well as alcohol and specifically notes that prescription and over-the-counter medications can support DUI allegations. It also discusses the difference between DUI, DWAI, DUI per se, administrative penalties, and refusal. Because NCDD is a secondary defense resource, the current Colorado statutes and official agency materials should control if there is any conflict.

Back to top

Finding a Prescription Drug DUI Defense Attorney in Denver and Colorado

A prescription drug DUI can be deceptively serious. The fact that the medication came from a doctor or pharmacy does not prevent prosecution, and these cases can lead to jail, fines, probation, useful public service, alcohol and drug treatment, license revocation, employment problems, and increased insurance costs. At the same time, a positive toxicology result does not automatically prove that a person was incapable of driving safely.

Prescription drug DUI cases frequently depend on details that are easy to overlook: whether the medication concentration was therapeutic, whether the defendant had developed tolerance, when the dose was taken, whether other substances were present, whether a medical condition explained the officer’s observations, whether the DRE evaluation was reliable, and whether the toxicology evidence actually supports impairment at the time of driving.

At the Law Office of Matthew A. Martin, P.C., we defend clients facing prescription drug DUI, drug DUI, DWAI, refusal, high BAC DUI, repeat DUI, and related impaired-driving allegations in Denver and throughout Colorado. We examine the stop, officer observations, body-camera footage, medical and prescription evidence, toxicology testing, DRE opinions, and DMV consequences and work to hold the prosecution to its burden on every required element.

If you have been charged with prescription drug DUI in Denver or the surrounding area, call (303) 725-0017 today or fill out an online consultation form to schedule your free consultation.

Avvo Rating
National Association of Criminal Defense Lawyers
Colorado Criminal Defense Bar
National College for DUI Defense
Better Business Bureau