# Regulus search export - Query: `73 FR 35971` - Source type: All - Part: All - Source: All - Status: All - Jurisdiction: All - Collection: All - Incident class: All - Sort: relevance - Date from: Any - Date to: Any - As of: Current corpus - Results: 2 - Exported: 2026-08-22T18:09:11.335Z ## 1. What happens if the laboratory reports a result different from that expected for a blind specimen? **Citation:** 49 CFR 40.105 **Type / status:** regulation / historical **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective / published:** 2017-10-01 / Not stated (a) If you are an employer, MRO, or C/TPA who submits a blind specimen, and if the result reported to the MRO is different from the result expected, you must investigate the discrepancy. (b) If the unexpected result is a false negative, you must provide the laboratory with the expected results (obt ### Provenance - Official: Yes - Source: - Source ID: `govinfo-cfr` - SHA-256: `2ccb5ccada22b14ffe7ea3ddc9a413cb48925c5c445b134eef8f172948fa23e0` - Retrieved: 2026-08-12T01:42:01.877Z - Document slug: `49-cfr-40-105` - Related records: 8 ## 2. What are the requirements for submitting blind specimens to a laboratory? **Citation:** 49 CFR 40.103 **Type / status:** regulation / historical **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective / published:** 2017-10-01 / Not stated (a) As an employer or C/TPA with an aggregate of 2000 or more DOT-covered employees, you must send blind specimens to laboratories you use. If you have an aggregate of fewer than 2000 DOT-covered employees, you are not required to provide blind specimens. (b) To each laboratory to which you send at ### Provenance - Official: Yes - Source: - Source ID: `govinfo-cfr` - SHA-256: `ab6a2ff5a0903ae7a29e312f36434530e05780548795bfdae00018a1bcaddfe3` - Retrieved: 2026-08-12T01:42:01.877Z - Document slug: `49-cfr-40-103` - Related records: 8