# Regulus search export - Query: `73 FR 35970` - 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: 2026-08-23T21:51:02.175Z ## 1. What criteria do laboratories use to establish that a specimen is invalid? **Citation:** 49 CFR 40.96 **Type / status:** regulation / historical **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective / published:** 2022-10-01 / Not stated (a) As a laboratory, you must use the invalid test result criteria for the initial and confirmation testing as required by the HHS Mandatory Guidelines, and you must use two separate aliquots—one for the initial test and another for the confirmation test. (b) As a laboratory, for a specimen having ### Provenance - Official: Yes - Source: - Source ID: `govinfo-cfr` - SHA-256: `e322d1163bc2e5d604815d57bb47c4b403fece6e5dc5d684f85e069ccac683af` - Retrieved: 2026-08-12T01:42:15.261Z - Document slug: `49-cfr-40-96` - Related records: 6 ## 2. What are the adulterant cutoff concentrations for initial and confirmation tests? **Citation:** 49 CFR 40.95 **Type / status:** regulation / historical **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective / published:** 2022-10-01 / Not stated (a) As a laboratory, you must use the cutoff concentrations for the initial and confirmation adulterant testing as required by the HHS Mandatory Guidelines and you must use two separate aliquots—one for the initial test and another for the confirmation test. (b) As a laboratory, you must report res ### Provenance - Official: Yes - Source: - Source ID: `govinfo-cfr` - SHA-256: `9ceaf6482fa0b2fad31284abf7d78c6eed17721462a8e27a575814eec24e03b7` - Retrieved: 2026-08-12T01:42:15.261Z - Document slug: `49-cfr-40-95` - Related records: 8