How Do Police Test for Marijuana Impairment in Illinois?

Jul 30, 2026

How Do Police Test for Marijuana Impairment in Illinois? Attorney Joshua Boardman from Combs Waterkotte discusses everything you need to know about Illinois DUI criminal charges, including first-time DUI, second DUI, Illinois DUI laws, DUI defense strategies, CDL DUI charges, and more.

Combs Waterkotte is a leading DUI defense law firm serving Illinois and Missouri. Our Illinois defense attorneys will fight for your freedom and rights. If you are facing DUI charges in Chicago or anywhere else in Illinois, we can help. Call us at (312) 500-HELP 24 hours a day, 7 days a week.

Interview Transcript

Scott Michael Dunn: How do police test for marijuana impairment in Illinois?

Joshua Boardman: Oftentimes, it’s done via a blood draw that would demonstrate what the THC levels in that person’s blood were at the time of the arrest.

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