{"operation":"document","citation":"49 CFR 40.181","title":"What does the second laboratory do with the split specimen when it is tested to reconfirm a substituted test result?","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"As the laboratory testing a urine split specimen, you must test the split specimen using the confirmatory tests for creatinine and specific gravity, using the criteria set forth in § 40.88.\n\n[88 FR 27646, May 2, 2023]","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-40-181.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-40-181.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-40-181","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-40.181","body":"As the laboratory testing a urine split specimen, you must test the split specimen using the confirmatory tests for creatinine and specific gravity, using the criteria set forth in § 40.88.\n\n[88 FR 27646, May 2, 2023]","truncated":false,"body_characters":217}