46 CFR Part 16 requires employers of commercial vessel operators and certain crewmembers to establish and maintain a chemical testing program. For independently licensed captains working through a crew placement service or directly for a vessel operator, consortium enrollment covers the requirement.
Who is covered
Any individual who operates a vessel in a safety-sensitive function for an employer subject to 46 CFR Part 16. This includes licensed OUPV and Master holders operating commercial vessels carrying passengers. Deckhands and unlicensed crew are not currently required to be in the program under Part 16, though individual operators may require it as a condition of employment.
Types of testing
Pre-employment: before beginning safety-sensitive duties for a new employer or after a gap in service of more than 30 days.
Random: a percentage of covered mariners are selected for testing throughout the year; rates are set annually by the USCG based on industry positivity data. Random testing must be unannounced.
Post-incident: required after a serious marine incident (as defined in 46 CFR Part 4), including groundings, collisions, significant property damage, or loss of life.
For-cause: when a reasonable suspicion exists that a mariner is impaired. The decision to test must be based on specific, articulable observations by a trained supervisor.
Return-to-duty and follow-up: required for mariners who have tested positive and been cleared by a Substance Abuse Professional (SAP).
Consortium enrollment
A third-party administrator (TPA) or consortium manages the random pool and collects test results for multiple employers. Joining a consortium satisfies the employer's testing program requirement for a licensed mariner working across multiple vessels. Enrollment typically runs $50–$150 annually plus per-test fees; verify current pricing with the consortium directly.
Where the rule lives
46 CFR Part 16, Title 46 of the Code of Federal Regulations. The USCG Marine Safety Information Bulletin database at dco.uscg.mil publishes updates. Do not rely on summaries; verify directly for the current requirements before applying for any license or employment.
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