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What is the scientific basis for laboratory chemical testing for drug use?

These tests are referred to as gas chromatography/mass spectrometry or immunoassay tests. "[T]he lab report is introduced as hearsay, which . . . is admissible in a violation of probation hearing." "An immunoassay test or, more properly "immunochemical assay" test, detects a "drug or its metabolites in the urine" because the substance acts as "an 'antigen,' combining with antibodies to the drug to form antigen-antibody complexes that can be detected" by a substance used in the laboratory or drug testing kit. Zeese, Drug Testing Legal Manual ' 2:23 (2d ed.). "There are three basic types of immunoassays: enzyme immunoassays, radio immunoassays, and fluorescent immunoassays." Id. "Immunoassays have been in existence since the 1950s and have been used to analyze biological fluids for low levels of enzymes, hormones, and drugs."
Source: Bell v State, Case No. 5D14-1569 (Fla 5th DCA 2015).

gas chromatography/mass spectrometry or immunoassay tests

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