49 CFR § 40.89 Procedures for Transportation Workplace Drug and Alcohol Testing Programs

§ 40.89 What are the adulterant cutoff concentrations for initial and confirmation urine tests?

Current through Sep 25, 2026 · Read all of Part 40

⚠ 1 pending change to Part 40

(a) As a laboratory, you must use the cutoff concentrations for the initial and confirmation adulterant testing as required by the HHS Mandatory Guidelines and you must use two separate aliquots—one for the initial test and another for the confirmation test.

(b) As a laboratory, you must report results at or above the cutoffs (or for pH, at or above or below the values, as appropriate) as adulterated and provide the numerical value that supports the adulterated result.

[73 FR 35970, June 25, 2008. Redesignated at 88 FR 27643, May 2, 2023]

← § 40.88 What criteria do laboratories use to establish that a urine specimen is dilute or substituted?§ 40.90 What criteria do laboratories use to establish that a urine specimen is invalid? →