{"data":{"id":"us/49-cfr-40.109","jurisdiction":"us","citation":"49 CFR 40.109","heading":"What documentation must the laboratory keep, and for how long?","body":"(a) As a laboratory, you must retain all records pertaining to each employee urine specimen for a minimum of two years.\n(b) As a laboratory, you must also keep for two years employer-specific data required in § 40.111.\n(c) Within the two-year period, the MRO, the employee, the employer, or a DOT agency may request in writing that you retain the records for an additional period of time (e.g., for the purpose of preserving evidence for litigation or a safety investigation). If you receive such a request, you must comply with it. If you do not receive such a request, you may discard the records at the end of the two-year period.","path":["Title 49—Transportation","Subtitle A—Office of the Secretary of Transportation","PART 40—PROCEDURES FOR TRANSPORTATION WORKPLACE DRUG AND ALCOHOL TESTING PROGRAMS","Subpart F—Drug Testing Laboratories"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"31008da63973729cc98ef02496e43aa733ef8c46720804cb463e3f4038fa4f64","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-40.107","next":"us/49-cfr-40.111"},"notice":"GroundRules: Original legal text. Not legal advice."}