What Drugs Don't Show Up on a Drug Test? Understanding the Gaps in Screening
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7 min read
Immunoassay drug tests, the most common form of screening, can fail to detect a wide range of substances, leading many to question what drugs don't show up on a drug test. This occurs due to specific drug properties, testing panel limitations, and the rapid evolution of new chemical compounds. A simple negative result does not always mean a person is drug-free.
