Wyoming DUI for Drugs: Controlled Substance DUI Penalties and Process

Wyoming's DUI statute — W.S. § 31-5-233 — covers driving under the influence of both alcohol and controlled substances under the same law. The criminal penalties for a first-offense drug DUI are identical on paper: up to 6 months in jail, a fine up to $750, probation of 1–3 years, and a mandatory substance abuse assessment. But the way a drug DUI plays out in practice differs from an alcohol case in several important ways.

How Drug DUI Is Detected and Tested

There is no roadside breath test for drugs. When an officer suspects drug impairment, the investigation relies on:

• Officer observations: Pupil dilation, unusual behavior, incoherent speech, inability to perform field sobriety tests, or signs inconsistent with alcohol impairment
• Drug Recognition Expert (DRE) evaluation: Some Wyoming law enforcement agencies have officers trained in a 12-step DRE protocol designed to identify the category of drug causing impairment
• Blood or urine test: The evidentiary chemical test for drug DUI is typically a blood draw, which is sent to a lab for toxicological analysis. Urine testing may be used as an alternative. Unlike breath tests that produce immediate BAC results, drug test results can take days or weeks to come back from the lab

The implied consent law applies the same way: refusing the evidentiary blood or urine test triggers a 6-month administrative license suspension, regardless of whether alcohol or drugs are involved.

The Administrative Track Works the Same Way

WYDOT's administrative license suspension is triggered by the implied consent process, not by the specific substance involved. If you refuse the test, you face the same 6-month suspension and IIRL requirements as an alcohol refusal.

Where it gets more nuanced: the administrative suspension for a failed test is keyed to BAC thresholds (0.08%, 0.15%). If a controlled-substance result does not correspond to the BAC thresholds above, rely on the WYDOT notice for the applicable administrative action and file any hearing request within the 20-day deadline.

Criminal Court Differences

While the statute and maximum penalties are the same, drug DUI cases differ from alcohol DUI in court:

Evidence timeline: Alcohol BAC results come back at the station within minutes. Drug toxicology results take days or weeks, which can delay the prosecution's ability to move forward. This sometimes creates additional time for defense preparation.

Presence vs. impairment: Blood tests can detect the presence of a drug, but proving current impairment at the time of driving is more complex than reading a BAC number. THC metabolites, for example, can remain detectable long after impairment has ended. Defense attorneys may challenge whether the test results actually prove impairment at the time of the stop.

Prescription medication: A first-offense drug DUI can involve legally prescribed medication. Wyoming law does not exempt you from DUI charges just because you have a valid prescription. If the medication impaired your ability to safely operate a vehicle, you can be charged and convicted.

Collateral Consequences Unique to Drug DUI

A drug-related DUI conviction carries collateral consequences that an alcohol-only DUI does not:

• Immigration: A conviction that references a controlled substance rather than alcohol can be classified as a drug offense under federal immigration law, which is treated more severely than an alcohol offense for visa, green card, and naturalization purposes
• Employment screening: Some employers and licensing boards distinguish between alcohol-related and drug-related offenses in their background check policies
• Treatment requirements: The mandatory substance abuse assessment (Addiction Severity Index) may result in a recommendation for drug-specific treatment rather than the standard alcohol education class, potentially increasing both duration and cost

Marijuana and Wyoming

A DUI involving marijuana is prosecuted under the controlled-substance provisions of W.S. § 31-5-233. The post-arrest process remains the same: preserve the permit and notice, address the 20-day hearing deadline, and obtain counsel about the testing and impairment evidence.

What to Do After a Drug DUI Arrest

The immediate steps are the same as for an alcohol DUI:

1. Preserve all arrest documents, including the temporary driving permit and suspension notice
2. File the 20-day hearing request with WYDOT to contest the administrative suspension
3. Consult with a defense attorney who has experience with drug DUI cases specifically — the defense strategies differ from alcohol cases
4. Complete the mandatory substance abuse assessment when ordered

The Wyoming First-Offense DUI Guide covers the full dual-track process — administrative and criminal — that applies whether the substance was alcohol, marijuana, prescription medication, or another controlled substance.

See more Wyoming guides →