DOT Rule 49 CFR Part 40 Section 40.93
Subpart F - Drug Testing Laboratories
§ 40.93 What validity tests must laboratories conduct on primary oral fluid specimens?
As a laboratory, if you conduct validity testing under § 40.92, you must conduct it in accordance with the requirements of this section.
(a) You may test for a biomarker such as albumin or immunoglobulin G (IgG) or a test for a specific adulterant.
(b) You must follow the applicable HHS requirements for any additional validity testing.
[88 FR 27643, May 2, 2023]