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

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Drug Testing Index

Non-negative rates by specimen validity test category, federally-mandated, safety-sensitive workforce, urine drug tests2 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.

For an interactive map showing urine drug test positivity in the United States, visit

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