StacksVerified U.S. regulatory reference

46 CFR §16.203

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Employers.
    1. (1)Employers must ensure that they and their crewmembers meet the requirements of this part.
    2. (2)Employers are responsible for all the actions of their officials, representatives, and agents in carrying out the requirements of this part.
    3. (3)All agreements and arrangements, written or unwritten, between and among employers and service agents concerning the implementation of DOT drug testing requirements are deemed, as a matter of law, to require compliance with all applicable provisions of this part and DOT agency drug testing regulations. Compliance with these provisions is a material term of all such agreements and arrangements.
  2. (b)Medical Review Officer (MRO).
    1. (1)Individuals performing MRO functions must meet the training requirements and follow the procedures in 49 CFR part 40.
    2. (2)MROs may report chemical drug test results to the Coast Guard for unemployed, self-employed, or individual mariners.
  3. (c)Substance Abuse Professional (SAP). Individuals performing SAP functions must meet the training requirements and follow the procedures in 49 CFR part 40.