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Illinois defense lawyerAlcoholic beverage drinkers can easily determine when they have drunk too much to drive. They can consult a simple chart that estimates blood alcohol concentration (BAC) based on gender, weight, and how many standard drinks they’ve had. Unfortunately, such simple charts do not exist for marijuana. So how can medical cannabis users know when they are safe to drive in Illinois and not get charged with driving under the influence?

Under current Illinois law, a THC level over 5 nanograms per milliliter of whole blood is per se (sufficient by itself) proof of marijuana DUI for most drivers. Illinois medical cannabis cardholders are exempt from the THC limit, but they can still be charged with DUI based on other evidence of impairment, primarily failure on the standardized field sobriety tests (walk-and-turn, one-leg stand, and follow-the-object eye test).

This article provides a basic explanation of how the body processes THC, the psychoactive compound in marijuana associated with driver impairment, to help users understand how marijuana may affect their ability to drive.

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