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Driving under the influence of drugs (DUID) is the operation of a motor vehicle while under the influence of or impaired by any type of drug, legal or illegal. This includes marijuana, prescription drugs, and some over-the-counter medications.
While research estimating the crash risk of driving under the influence of drugs is ongoing, many experimental studies have shown that drugs impair attention, alertness, reaction time, lane tracking, coordination, and perception of time and distance. Even small amounts of some drugs can have a serious effect on driving ability.
In 2016, California voters approved Proposition 64, the Medicinal and Adult-Use Cannabis Regulation and Safety Act. This law allows adults 21 and over to purchase, possess, and consume up to 28.5 grams of marijuana in their private residence or in an establishment licensed for marijuana consumption.
To buy medicinal cannabis, you must be 18 or older and have either a current physician’s recommendation, a valid county-issued medical marijuana identification card, or be a Primary Caregiver as defined in Health and Safety Code Section 11362.7(d).
In California, the same statute that makes alcohol-impaired driving illegal also covers drug-impaired driving. This law makes it unlawful to drive while:
Driving under the influence of alcohol or drugs has the same legal and financial consequences:
The California Department of Public Health has information on their “Let’s Talk Cannabis” website regarding what is legal for adult use in California.
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treds.ucsd.edu/contact
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