| http://www.w3.org/ns/prov#value | - Who Should Be Screened?When Should Screening Occur?Testing MethodsApplying Test ResultsPreventing and Detecting Specimen TamperingLegal Issues for Drug TestingReferencesThe concentration of a drug in urine depends on several factors, including time since use, amount and frequency of use, fluid intake, body fat percentage, and metabolic factors.
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