{"operation":"document","citation":"49 CFR 40.109","title":"What documentation must the laboratory keep, and for how long?","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"(a) As a laboratory, you must retain all records pertaining to each employee urine specimen for a minimum of two years.\n\n(b) As a laboratory, you must also keep for two years employer-specific data required in § 40.111.\n\n(c) Within the two-year period, the MRO, the employee, the employer, or a DOT a","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-40-109.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-40-109.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-40-109","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-40.109","body":"(a) As a laboratory, you must retain all records pertaining to each employee urine specimen for a minimum of two years.\n\n(b) As a laboratory, you must also keep for two years employer-specific data required in § 40.111.\n\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.","truncated":false,"body_characters":635}