The are laws in all 50 states that make it illegal to use marijuana and drive. Within the last year the Supreme court in Michigan dismissed a medical marijuana case as he tested positive, legally with his card, but passed all field sobriety tests.
An officer can legally refrain you from operating your vehicle if they have probable cause to think you are unfit to drive, such as sleep deprivation or an acute medical condition. Basically, the same laws that are in place for alcohol pertain to marijuana use...this is exactly what permits it from infringing on others.
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