A drug test looks for the presence or absence of a drug in a biological sample, such as urine, blood, or hair. Drug tests may also look for drug metabolites in the sample. A drug metabolite is a substance made or used when the body breaks down (or &#;metabolizes&#;) a drug.
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Drug tests target only specific drugs or drug classes above a predetermined cutoff level.1 A cutoff level is a point of measurement at or above which a result is considered positive and below which a result is considered negative. For example, in workplace drug testing the federal cutoff level for a cannabis drug test in urine is 50ng/mL. A test result below 50ng/mL will be reported as negative even if the result is above 0. This cutoff level helps to limit false positives.2
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Drug testing is different than &#;drug checking,&#; which helps people who use drugs determine which chemicals are found in the substance they intend to take. Drug checking is a type of harm reduction.
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