Why Test for Recent Cannabis Use?

“Cannabis only causes impairment for a few hours after smoking. But traces of THC can stay in the body in varying amounts for many days or even weeks after a person last used cannabis. Although THC does not cause impairment for days or weeks after use, past use can still trigger a positive drug test. In the era of cannabis legalization, it is important to understand ‘when’ someone used cannabis, not just ‘if.'”

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