A guide explains the difference between THC testing and cannabis impairment testing. Traditional THC tests — using urine, saliva, blood, or hair — detect past cannabis use but cannot reliably determine whether a person is currently impaired. Because THC can remain in the body long after its effects wear off, positive results do not necessarily indicate impairment. The article argues that impairment testing, which measures real-time indicators such as reaction time, cognition, coordination, and eye movements, provides a fairer and more accurate assessment of a person’s current ability to work or drive safely.

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