Code of Federal Regulations > Title 49 > Chapter A > Part 40 > Subpart I - Subpart I—Problems in Drug Tests

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

§ 40.191 - What is a refusal to take a DOT drug test, and what are the consequences?

§ 40.193 - What happens when an employee does not provide a sufficient amount of specimen for a drug test?

§ 40.195 - What happens when an individual is unable to provide a sufficient amount of specimen for a pre-employment, follow-up, or return-to-duty test because of a permanent or long-term medical condition?

§ 40.197 - What happens when an employer receives a report of a dilute urine specimen?

§ 40.199 - What problems always cause a drug test to be cancelled?

§ 40.201 - What problems always cause a drug test to be cancelled and may result in a requirement for another collection?

§ 40.203 - What problems cause a drug test to be cancelled unless they are corrected?

§ 40.205 - How are drug test problems corrected?

§ 40.207 - What is the effect of a cancelled drug test?

§ 40.208 - What problems require corrective action but do not result in the cancellation of a test?

§ 40.209 - What procedural problems do not result in the cancellation of a test and do not require correction?

§ 40.210 - What kinds of drug tests are permitted under the regulations?