California DUI law does not differentiate between drug and alcohol impairment.
Peck
R C
RC
D000428:Alcohol Drinking / Q000097:blood / Q000331:legislation & jurisprudence*; D001334:Automobile Driving / Q000331:legislation & jurisprudence*; D002140:California; D006801:Humans; D013287:Illicit Drugs / Q000331:legislation & jurisprudence*; D008960:Models, Psychological; D012008:Recurrence; D012926:Social Control, Formal / Q000379:methods; D015813:Substance Abuse Detection / Q000331:legislation & jurisprudence*; D009626:Terminology as Topic
D013287:Illicit Drugs