Duration depends on the biological matrix
Workplace drug testing is based on the Substance Abuse and Mental Health Administration’s 5-panel immunoassay commonly referred to as SAMHSA-5. This panel traditionally tests five categories of drugs: amphetamines, marijuana, cocaine, opiates, and phencyclidine (PCP). Most commercially available drug screens also test for alcohol, barbiturates, benzodiazepines, MDMA (ecstasy), and synthetic opioids (oxycodone, hydrocodone, buprenorphine, and methadone) in addition to the SAMSHA-5 panel.
The duration over which these drugs can be detected depends upon the biological matrix in which they are tested.
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