Drug DUI Defense in CaliforniaCalifornia Vehicle Code § 23152(f)
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What Is a Drug DUI in California?
California Vehicle Code § 23152(f) makes it illegal to drive under the influence of any drug — legal or illegal — that impairs your ability to drive safely. This includes marijuana, prescription medications like Xanax, Adderall, Ambien, and opioids, as well as illegal drugs like methamphetamine, cocaine, heroin, and MDMA. Unlike alcohol DUI, there is no per se legal limit for most drugs — the prosecution must prove impairment based on the totality of evidence.
How Police Detect Drug DUI
Officers trained as Drug Recognition Experts (DREs) follow a 12-step evaluation process to determine whether a driver is impaired by drugs and identify the category of drug. This includes checking pulse rate, pupil size, muscle tone, and performing various physical tests. Blood tests are typically ordered rather than breath tests, since breathalyzers only detect alcohol. The blood sample is analyzed for the presence of specific drugs and their metabolites.
Marijuana DUI After Legalization
Despite the legalization of recreational marijuana in California, driving under its influence remains illegal. There is no established legal THC blood limit in California — unlike the 0.08% BAC threshold for alcohol. This makes marijuana DUI cases highly subjective and aggressively contestable. The mere presence of THC in your blood does not prove impairment, as THC can remain detectable for days or weeks after use without any current impairment.
Prescription Drug DUI
Driving while impaired by legally prescribed medication is still a DUI offense. Many patients are unaware that medications they take as directed can result in criminal charges. Common prescription drugs that can trigger DUI charges include benzodiazepines (Xanax, Valium), sleep aids (Ambien), opioid pain relievers (Vicodin, OxyContin), and stimulants (Adderall). The fact that you have a valid prescription is not a complete defense.
Defenses to Drug DUI Charges
Our attorneys challenge DUI drug cases by questioning the DRE evaluation methodology, challenging the accuracy and chain of custody of blood test results, arguing that the presence of a drug does not prove impairment, presenting expert witnesses on pharmacokinetics, and challenging the initial traffic stop. Many drug DUI cases are successfully reduced or dismissed through aggressive defense.
Contact Virtuoso Law — Available 24/7
Drug DUI cases are complex and require attorneys experienced in both DUI defense and drug law. Call (833) 666-5245 immediately. We serve the Bay Area and Central Valley.