Facing a DUI involving drugs (DUID) charge in Colorado is serious—and the consequences can affect your freedom, finances, and future. Whether you were using prescription medication, marijuana, or another substance, you still have legal rights. At Alfrey & Associates, PC, we believe in building aggressive, strategic defenses tailored to your case.

Here’s how we challenge DUID charges—and what defenses might apply to your situation.

🚨 What Is a DUID in Colorado?

Colorado law prohibits operating a motor vehicle while impaired “to the slightest degree” by any drug, whether it’s legal or illegal. This includes:

• Prescription drugs like painkillers, sleep aids, or antidepressants
• Over-the-counter medications like cold and allergy remedies
• Marijuana, even if used legally
• Illicit substances such as meth, heroin, or cocaine

Unlike alcohol-related DUIs, there’s often no clear-cut “legal limit” for most substances. That gives law enforcement more discretion—and leaves more room for error.

🔍 Defense 1: Lack of Probable Cause

Police must have a valid reason to stop you. If they pulled you over without reasonable suspicion of a traffic violation or erratic behavior, we can challenge the legality of the stop. Any evidence collected after an illegal stop—including test results—can be suppressed.

🧪 Defense 2: Inaccurate or Improper Chemical Testing

Blood and urine tests are often used to detect drugs—but they’re far from perfect. Our firm investigates:

• Chain of custody issues
• Improper storage of samples
• Lab errors or contamination
• Testing for inactive metabolites that don’t indicate impairment

These weaknesses can raise reasonable doubt and help us push for a reduction or dismissal.

👮‍♂️ Defense 3: Challenging the Officer’s Observations

In many DUID cases, officers rely on field sobriety tests and subjective evaluations—like pupil size or speech patterns. But medical conditions, fatigue, or even anxiety can mimic impairment symptoms. We use expert testimony and cross-examination to challenge the credibility of these claims.

📉 Defense 4: Lack of Actual Impairment

Just because a substance is present in your system doesn’t mean you were impaired. Some drugs stay in your bloodstream for days or weeks. This is especially relevant in marijuana cases, where THC metabolites may be detectable long after the effects wear off. We argue the difference between presence and impairment to protect your rights.

⚖️ Defense 5: Legal Medical Use

If you were using lawfully prescribed medication and were not impaired, that can form the basis of your defense. Colorado does not automatically criminalize driving after taking medication—but you must be alert and able to drive safely. We present medical records, pharmacy history, and doctor testimony to support your case.

⏳ Don’t Wait—Get Legal Help Right Away

A DUID conviction can result in jail time, license suspension, steep fines, and a permanent mark on your record. But the sooner you act, the more options you have. Delays make it harder to gather evidence, challenge test results, or prepare a strong case.



At Alfrey & Associates, PC, we know Colorado’s DUID laws inside and out. We dig deep into every case, challenge every weakness, and fight for the best possible outcome.