# What documentation must the laboratory keep, and for how long?

- **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:** Not available
- **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.

(b) As a laboratory, you must also keep for two years employer-specific data required in § 40.111.

(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.

(b) As a laboratory, you must also keep for two years employer-specific data required in § 40.111.

(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