Federal Drug Testing Cutoff Levels. A detection period for drug testing kits is the amount of time after consuming a drug that a particular testing method can provide a positive drug test result. A cutoff level is the defined concentration of a substance in a specimen.Drug-testing hair is a simple and noninvasive way to detect drug use over a greater length of time, most effective when testing for regular use of drugs such as cocaine, methamphetamines and opiates.
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