Screening Test. A preliminary test. For a urine test it is an immunoassay or a thin-layer chromatography test which identifies the presence of a drug / metabolite in an individual’s system and which generally is 92-98% reliable. For measuring the amount of alcohol in a person’s system it is generally a certified breath or saliva test (although blood testing may be used when breath or saliva screenings cannot meet the necessary quality standards).
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