Last verified: March 2026

How Nevada's Cannabis DUI Law Works

Cannabis-related DUI in Nevada is governed by NRS Chapter 484C. In 2021, Assembly Bill 400 (effective July 1, 2021) fundamentally reformed how cannabis DUI cases are prosecuted, creating a two-tier system that distinguishes between first/second offenses and third or subsequent offenses.

First and Second Offenses: Actual Impairment Required

For first and second DUI offenses (within a 7-year period), prosecutors must prove actual impairment — that the driver was "incapable of safely driving." This was a landmark change. Under the old law, simply having THC in your blood above a threshold was enough for conviction. Now, blood THC levels alone are insufficient to convict on a first or second offense.

This means prosecutors must rely on evidence like field sobriety test results, officer observations, driving behavior, and other indicators of impairment — not just a blood test number.

Third or Subsequent Offenses: Per Se Limits Apply

For a third or subsequent DUI offense within 7 years (which is charged as a felony), the old per se THC limits still apply. A driver can be convicted based solely on blood levels exceeding:

• 2 ng/mL of delta-9-THC (the active compound)
• 5 ng/mL of marijuana metabolite (11-OH-THC or THC-COOH)

At the felony level, the prosecution does not need to prove you were actually impaired — exceeding these blood levels is sufficient for conviction.

AB 400 reformed Nevada DUI law so that for first and second offenses, prosecutors must prove actual impairment — that the driver was incapable of safely driving. Blood THC levels alone are insufficient for conviction.

AB 400 (2021) — Nevada Legislature

DUI Penalty Chart

First Offense (Misdemeanor)

Second Offense Within 7 Years (Misdemeanor)

Third Offense Within 7 Years (Category B Felony)

Medical Marijuana Card Is Not a Defense

Having a valid Nevada medical marijuana card — or an out-of-state medical card — provides no defense against a DUI charge. Even if you are legally authorized to use cannabis for a medical condition, you cannot legally drive while impaired. The legal protections that come with a medical card do not extend to operating a vehicle.

Implied Consent: You Can't Refuse a Test

Nevada's implied consent law means that by driving on Nevada roads, you have already consented to chemical testing (blood or breath) if an officer has reasonable grounds to believe you are impaired. Refusing a blood or breath test does not help you avoid a DUI — it triggers an automatic license suspension and the refusal itself can be used against you in court.

Practical Tips for Cannabis Users

• Use rideshare services. Uber, Lyft, and taxis are widely available in Las Vegas and Reno. This is the simplest way to avoid any risk.
• Wait before driving. THC impairment from smoking typically peaks within 15–30 minutes and can last 2–4 hours. Edibles can impair for 6–8 hours or longer.
• Store cannabis properly in your vehicle. Keep it in the trunk or glove box, sealed and out of the driver's reach.
• Don't consume in the vehicle. Consuming cannabis in a moving vehicle — even as a passenger — is illegal under public consumption laws.

How Cannabis DUI Differs from Alcohol DUI

Unlike alcohol, there is no reliable roadside test for cannabis impairment. THC metabolites can remain in blood for days or weeks after use, long after impairment has worn off. This is precisely why AB 400 reformed the law — the legislature recognized that blood THC levels are a poor proxy for actual driving impairment, at least for first and second offenses.

However, law enforcement officers trained as Drug Recognition Experts (DREs) can still assess impairment through a series of physical and cognitive tests. Their observations, combined with blood test results and driving behavior evidence, form the prosecution's case.

For more on how cannabis affects driving ability and reaction time, see Driving & Impairment on TryCannabis.org.