49 C.F.R. § 40.89 What is validity testing, and are laboratories required to conduct it?
Title 49 - Transportation
(a) Specimen validity testing is the evaluation of the specimen to determine if it is consistent with normal human urine. The purpose of validity testing is to determine whether certain adulterants or foreign substances were added to the urine, if the urine was diluted, or if the specimen was substituted. (b) As a laboratory, you are authorized to conduct validity testing. [65 FR 79526, Dec. 19, 2000, as amended at 66 FR 41951, Aug. 9, 2001]
Title 49: Transportation
PART 40—PROCEDURES FOR TRANSPORTATION WORKPLACE DRUG AND ALCOHOL TESTING PROGRAMS
Subpart F—Drug Testing Laboratories
§ 40.89 What is validity testing, and are laboratories required to conduct it?
