{"data":{"id":"us/49-cfr-40.181","jurisdiction":"us","citation":"49 CFR 40.181","heading":"What does the second laboratory do with the split specimen when it is tested to reconfirm a substituted test result?","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.","path":["Title 49—Transportation","Subtitle A—Office of the Secretary of Transportation","PART 40—PROCEDURES FOR TRANSPORTATION WORKPLACE DRUG AND ALCOHOL TESTING PROGRAMS","Subpart H—Split Specimen Tests"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"d3eef89b5858e061bae0a8fe276c350854261c3e6805d1b7d219a8e1994a7d7b","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-40.179","next":"us/49-cfr-40.183"},"notice":"GroundRules: Original legal text. Not legal advice."}