Non-Negative Rates by Specimen Validity Test Category - Urine Drug Tests for Federally Mandated, Safety-Sensitive Workforce

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Drug Testing Index

Quest Diagnostics Drug Testing Index non-negative rates by specimen validity test category, federally mandated, safety-sensitive workforce2 Specimen validity testing is the evaluation of a specimen to determine if it is consistent with a normal human specimen. Tests for specimen validity include tests to determine whether a specimen is adulterated or substituted.

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