Question: How do police test a person to see if he or she is under the influence of a controlled substance in Wisconsin?

Answer: The most common test in Wisconsin—if they’re talking about an actual test, not just trying to determine if the person may be under the influence—the most common is either to do a quick urinalysis. That is often used at probation, parole, department of corrections, incoming—if you’re checking into a jail or checking in with the sheriff’s department, they will sometimes use a urinalysis to determine if there are any controlled substances in the urine. In other types of cases or more serious offenses, they will sometimes take a blood draw and then analyze the blood to determine if there are any controlled substances present.

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