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Drug Testing

DOT Rule 49 CFR Part 40 Section 40.99

Subpart F - Drug Testing Laboratories

§ 40.99 How long does the laboratory retain specimens after testing?
(a) As a laboratory testing the primary specimen, you must retain a specimen that was reported with positive, adulterated, substituted, or invalid results for a minimum of one year.
(b) You must keep such a specimen in secure, long-term, frozen storage in accordance w