- § 40.81 What laboratories may be used for DOT drug testing?
- § 40.82 What drugs do laboratories test for?
- § 40.83 How do laboratories process incoming specimens?
- Section 40.83 Questions and Answers
- § 40.84 How long does the laboratory retain specimens after testing?
- § 40.85 What are the cutoff concentrations for urine drug tests?
- § 40.86 What is urine validity testing, and are laboratories required to conduct it?
- § 40.87 What validity tests must laboratories conduct on primary urine specimens?
- § 40.88 What criteria do laboratories use to establish that a urine specimen is dilute or substituted?
- § 40.89 What are the adulterant cutoff concentrations for initial and confirmation urine tests?
- § 40.90 What criteria do laboratories use to establish that a urine specimen is invalid?
- § 40.91 What are the cutoff concentrations for oral fluid drug tests?
- § 40.92 What is oral fluid validity testing, and are laboratories required to conduct it?
- § 40.93 What validity tests must laboratories conduct on primary oral fluid specimens?
- § 40.97 What do laboratories report and how do they report it?
- Section 40.97 Questions and Answers
- § 40.101 What relationship may a laboratory have with an MRO?
- § 40.107 Who may inspect laboratories?
- § 40.109 What documentation must the laboratory keep, and for how long?
- § 40.111 When and how must a laboratory disclose statistical summaries and other information it maintains?
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