Glossary

Adulterated specimen

A specimen that contains a substance that is not normally present, or shows abnormal physical properties.

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A specimen is reported as adulterated if it contains an added substance (e.g., bleach, nitrites) or has abnormal pH/creatinine/specific gravity. Adulteration is treated as a refusal to test under DOT-regulated programs and triggers the consequences of a positive result.

Sources & references

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  1. 49 CFR Part 40 — Procedures for Transportation Workplace Drug and Alcohol Testing Programs — U.S. Department of Transportation

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