Next time you’re driving on a weekend night, take a look around at your fellow drivers. One out of eight is likely to test positive for illegal drugs. Each year, thousands of fatally injured drivers also test positive for drugs. It’s no wonder that Driving Under the Influence of Drugs (DUID) has become subject of auto safety crusaders from the Department of Transportation to Mothers Against Drunk Drivers.

Every state prohibits driving while impaired by drugs but the states differ as to what is a drug, whether consent for testing is implied, and what concentration of drugs within the body constitute impairment. Some states simply establish zero tolerance rules – any amount of drugs in the bloodstream is a violation. Others designate specific drugs and dictate the concentration amounting to impairment.

If you’re unsure of the law in your state, review our state-by-state guide below.

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