In this guide
If you employ crew on a commercial vessel, the Coast Guard requires you to run a random drug testing program — not just test people when something goes wrong. The rule is 46 CFR 16.230, and getting it right means understanding who belongs in your pool, how selection must work, what rate you need to hit, and whether to run the program yourself or through a USCG-recognized consortium.
Who Has to Be in Your Random Pool
Coverage under 46 CFR 16.230 depends on your vessel type, but the underlying principle is the same: duties, not job titles.
Inspected Vessels
- → Every crewmember in a position required by the vessel's Certificate of Inspection
- → Anyone performing required patrolman or watchman duties
- → Anyone assigned to warn, muster, or assist passengers during emergencies
Uninspected Vessels
- → Crewmembers required to hold a Coast Guard credential for their position
- → Anyone whose duties directly relate to the safe operation of the vessel
- → Same watchman and passenger-emergency categories as inspected vessels
When in doubt, include them
A deckhand with no credential who handles lines and stands lookout is performing duties "directly related to the safe operation of the vessel" and belongs in the pool. An underinclusive pool is the more expensive mistake — it shows up quickly in a Coast Guard exam or post-incident review.
One more provision that surprises owner-operators: under 16.230(k), no one may serve as master, operator, or person in charge — including in self-employment — unless all covered crewmembers on the vessel are subject to random testing. You can't exempt yourself, and you can't exempt your crew. For more on how this plays out in a self-employed context, see our post on what happens to sole owner-operators after a positive test.
How Selection Has to Work
The Coast Guard doesn't let you pick names off a clipboard. Selection must use a scientifically valid method — a random number table or a computer-based random number generator matched to an identifying number like a payroll ID. Two conditions must hold every time you draw:
There's an alternative for multi-vessel operators: you may randomly select one or more vessels and test everyone covered aboard, as long as every vessel in your program remains equally subject to selection.
Two requirements trip up employers who technically randomize but execute poorly. Tests must be unannounced, and testing dates must be spread reasonably throughout the calendar year. Running all your tests in December to hit your annual number fails the "spread reasonably" requirement even if the math works out.
Document every selection event — who was selected, when, and by what method. That record is what you produce when the Coast Guard asks.
Hitting the Testing Rate
You must test at a rate at least equal to the minimum annual percentage the Commandant publishes in the Federal Register each year. For 2026, the rate is 50% of covered crewmembers — the regulatory floor set in 46 CFR 16.230(e). See our earlier post on the 2026 DOT random testing rates for how the annual rate-setting process works across all DOT modes.
What 50% looks like in practice
| Covered Crew | Min. Tests / Year | Practical Approach |
|---|---|---|
| 2 | 1 | 1 draw, 1 test, spread through the year |
| 4 | 2 | Multiple selection events; tests spread across calendar |
| 10 | 5 | Quarterly draws recommended to meet "spread" requirement |
| 50+ | 25+ | Consortium pool handles rate calculation automatically |
If a crewmember falls under more than one DOT agency's testing rules for the same employer, they're tested at the rate set by the agency regulating more than 50% of their work. Employers subject to multiple DOT agencies can either keep separate pools by required rate or test everyone at the highest applicable rate.
Let APCA manage your random pool
APCA is a USCG-approved C/TPA. We handle random selection, documentation, OCMI reporting, and annual MIS filing — so your job is keeping your crew roster current, not managing federal filings.
Run It Yourself or Join a Consortium
46 CFR 16.230(d) explicitly permits marine employers to use consortia or contractors to run their random testing programs. And 16.230(g) lets the required number of tests be calculated across the consortium's total combined pool — not employer by employer.
That combined-pool provision is the practical reason most small operators join a consortium. In a two-person operation, self-administered random testing is awkward at best — it's hard to be "unannounced" to yourself, and a selection you control invites scrutiny. In a consortium pool of thousands, selection is independent, unannounced by design, and the documentation is generated for you.
Self-administered
C/TPA / Consortium
A C/TPA can also handle the reporting the Coast Guard requires after a positive test — including OCMI notification under 46 CFR § 16.240 — as your authorized agent. For more on what that reporting looks like when you're both the employer and the mariner, see our post on owner-operators and failed drug tests.
See our pricing page for current APCA enrollment rates.
The Bottom Line
Put every crewmember whose duties touch vessel safety in the pool, select them by a genuinely random method, test at least 50% of the pool per year, keep tests unannounced and spread across the calendar, and document every draw.
If running that in-house sounds like more administration than your operation can absorb, a Coast Guard-recognized C/TPA like APCA exists for exactly this purpose — and consortium membership is how most small marine operators stay demonstrably compliant without adding a compliance staff.
APCA is a USCG-approved C/TPA
Random pool management, selection records, OCMI reporting, and annual MIS filing — all handled for enrolled marine employers.
Frequently Asked Questions
What is the USCG random drug testing rate for 2026?
The minimum annual rate is 50% of covered crewmembers, matching the regulatory floor in 46 CFR 16.230(e). The Commandant publishes the rate in the Federal Register each year, effective January 1. Always confirm the current year's rate before setting your testing calendar.
Do uncredentialed deckhands need to be in the random pool?
Usually yes. On uninspected vessels, coverage includes anyone performing duties directly related to the safe operation of the vessel — credential or not. Handling lines, standing watch, or assisting passengers in an emergency all qualify under 46 CFR 16.230(b).
Can I run my own random testing program as an owner-operator?
The regulation permits self-administered programs, but 16.230(k) requires that all covered crew — including a self-employed master or operator — be subject to random testing. In practice, one- and two-person operations join a consortium because independent selection is difficult to demonstrate otherwise. If you want to self-administer, verify your program design directly with the USCG.
Is alcohol included in USCG random testing?
No. Random testing under 46 CFR Part 16 covers dangerous drugs only. Alcohol testing arises in other contexts, such as after a serious marine incident.