On January 1, 2018, recreational marijuana becomes legal. That means that you do not need a prescription to purchase it, nor will it be against the law. However, that does not mean that there are no restrictions on it’s use. Marijuana will be restricted just like any other similar substance, such as cigarettes and alcohol.
One such restriction is use while driving. Like alcohol, you cannot be under the influence of marijuana while operating a vehicle. California Vehicle Codes §20002 and 20003 make it unlawful to operate a vehicle while driving under the influence of alcohol and/or drugs. Marijuana, whether legal or not, falls under this category.
However, unlike alcohol, the influence of marijuana is more difficult to provide when stopped for suspicion of driving under the influence. In cases where there is suspicion of alcohol intoxication, an office may request that a driver submit to a blood alcohol test. The alcohol test may be taken through blood, breath or urine and gives an immediate measurement of the amount of alcohol that is in your blood stream at that moment in time. Alcohol will only remain in your blood stream for a minimal amount of time.