The short version
- 46 CFR 16.230(e) sets the minimum random rate at 50 percent unless the Commandant publishes otherwise.
- The annual rate lives in a Federal Register notice, not in the CFR. The most recent indexed notice is April 2021, for 2021, at 50 percent.
- Part 16 creates five testing duties. Reasonable cause and return to work are the two operators skip.
- 16.230(k) bars employment as Master, operator or Person in Charge unless the random programme is running.
- Every result passes a Medical Review Officer under 49 CFR 40.121 before it becomes a finding.
The number every operator asks for is not in the regulation
Search 46 CFR part 16 for this year’s random testing rate and you will not find it. The rule sets a default and then hands the number to a Federal Register notice.
46 CFR 16.230(e) and (f)
“Except as provided in paragraph (f) of this section, the minimum annual percentage rate for random drug testing must be 50 percent of covered crewmembers.” Paragraph (f) lets the Commandant adjust it, and provides that “each year, the Commandant will publish in the Federal Register the minimum annual percentage rate”, applicable from 1 January of the following calendar year.[1]
So the rate is 50 percent unless a published notice says otherwise, and the mechanism for saying otherwise is narrow. The Commandant may drop it to 25 percent only where two consecutive years of MIS data show an industry positive rate below 1.0 percent, and must raise it back to 50 percent if any year comes in at or above 1.0 percent.[1]
The most recent rate notice indexed in the Federal Register is 27 April 2021, setting calendar year 2021 at 50 percent.[2] Treat 50 percent as the operating figure and confirm the current year against the Federal Register before you build the pool, because the number lives outside the CFR by design.
Five separate testing duties, and operators usually run three
46 CFR part 16 is not one programme. It is five, with different triggers, different populations and different paperwork.
| Duty | Trigger | Where it lives |
|---|---|---|
| Pre-employment and periodic | Original issue, first issue, raise of grade or renewal of an endorsement, and pilots’ annual physicals[3] | 16.220. Results not more than 185 days old |
| Random | Continuous, across covered crewmembers[1] | 16.230. Rate set outside the CFR |
| Serious marine incident | An SMI, including the medical limb[4] | 16.240, which points at subpart 4.06 |
| Reasonable cause | Articulable belief of use, ideally observed by two supervisors[5] | 16.250. Logbook entry required |
| Return to work | After a failed test, once the MRO clears the individual[6] | 16.201(f). Minimum six tests in year one |
Pre-employment sits beside the crew medical record and, on a fishing hull, beside 46 CFR 28.210. The two that get missed are reasonable cause and return to work, because both require someone to make a judgement and write it down. The serious marine incident duty has its own two hour and 32 hour clocks and is covered separately.
Who is covered is a job description, not a headcount
46 CFR 16.230 splits the covered population by vessel type and then by function.[1]
- Inspected vessels. Anyone occupying or performing the duties of a position required by the Certificate of Inspection, plus patrolmen and watchmen required by the chapter, plus anyone specifically assigned to warn, muster, assemble, assist or control passengers during emergencies.[1]
- Uninspected vessels. Anyone required to hold a Coast Guard credential to perform their duties, anyone performing duties directly related to safe operation, patrolmen and watchmen, and the same passenger control role.[1]
On a small passenger vessel that limb can be most of the crew, and on a towing vessel the credential test does most of the work. The passenger control limb catches people who would not describe themselves as crew. On an uninspected vessel the credential test does the work instead, and the class comparison in our vessel class review is a useful map of which regime a hull sits in.
A hidden employment bar on the master
Buried at the end of 16.230 is a provision that turns a programme failure into a personal one.
46 CFR 16.230(k)
An individual may not be engaged or employed, including self-employment, on a vessel in a position as Master, operator, or Person in Charge for which a credential is required, unless all crewmembers covered by that section are subject to the random testing requirements.[1]
Read as an owner: if the random programme is not running, your master is not lawfully employable in that seat. Read as a master: your own position depends on a compliance programme somebody ashore maintains. That is the same structure as the medicine chest statute, where the penalty runs against owner and master together.
Where the physician sits in a drug testing programme
Part 16 is usually treated as an HR function. Two provisions put a clinician at the centre of it.
First, every laboratory result goes to a Medical Review Officer meeting 49 CFR 40.121, who reviews a positive and determines whether there is a legitimate medical explanation.[7] Second, after a failure, the MRO must determine that the individual is drug free and that the risk of subsequent use is sufficiently low to justify return to work, and the individual then faces a minimum of six unannounced tests in the first year and up to 60 months of additional testing at the MRO’s discretion.[6]
Prescription items in the ship’s medicine chest raise the same question from the other direction, and anything scheduled brings 21 CFR 1301.25 with it. A crewmember on prescription medication is the ordinary case, not the exception, and it is a clinical question rather than an administrative one. That is why it sits next to the crew medical record and why our maritime medical consulting line is involved at all.
What a failed test does, immediately
16.201 is short and consequential.[6]
| Situation | Consequence | Who acts |
|---|---|---|
| Failed test, credentialed individual | Report the result in writing to the nearest Officer in Charge, Marine Inspection; deny employment or remove from safety-affecting duties as soon as practicable[6] | Employer or sponsoring organisation |
| Failed test, no credential | Denied employment as a crewmember or removed from safety-affecting duties as soon as possible[6] | Employer |
| Refusal on reasonable cause | Entered in the vessel’s official logbook where one is required[5] | Master |
Failing is also presumptive: 16.201(b) provides that an individual who fails a chemical test for dangerous drugs will be presumed to be a user of dangerous drugs.[6] The rebuttal route runs through the MRO, not through the employer.
Records, and the number the Coast Guard actually asks for
46 CFR 16.260 requires employers to keep records as provided in 49 CFR part 40, specifically 49 CFR 40.333 and make them available to Coast Guard officials on request.[8] The records must identify the total number of individuals tested annually in each category, the number failing, and the number and types of drugs returning positives.[8]
Where an incident is involved, the reporting threshold and the death on board procedure generate their own records on separate clocks. That last requirement is the one that catches consortium members out. The consortium holds the data, the marine employer owes the answer. An audit walkthrough should ask for it in the employer’s own file, and an inspection checklist treats it the same way as controlled substance records.
Seven checks on your part 16 programme
- Confirm this year’s rate in the Federal Register, and default to 50 percent.[1][2]
- Rebuild the covered pool by function, including the passenger control role.[1]
- Check the 185 day window on every pre-employment and periodic result you are relying on.[3]
- Write the reasonable cause procedure, including the two supervisor observation and the logbook entry.[5]
- Name your MRO and confirm the return to work protocol, six tests minimum in year one.[6][7]
- Hold the annual MIS numbers in your own file, not only at the consortium.[8]
- Check 16.230(k) against your masters. No running programme, no lawful employment in that seat.[1]
Discovery Health MD is led by Ann Jarris MD, MBA, FACEP, a board certified emergency physician. Part 16 is where crew health, prescription medication and compliance meet, and it belongs beside the rest of the medical programme rather than in a separate folder. Fleets that change flag should note that this regime follows the US credential and the vessel, not the register. Speak to the team.
Common questions
What is the USCG random drug testing rate?
The regulation sets 50 percent and the annual figure is published outside the CFR. 46 CFR 16.230(e) provides that, except as adjusted under paragraph (f), the minimum annual percentage rate for random drug testing must be 50 percent of covered crewmembers, and paragraph (f) provides that each year the Commandant will publish the minimum annual percentage rate in the Federal Register, applicable from 1 January of the following calendar year[1]. The most recent rate notice indexed in the Federal Register is 27 April 2021, setting calendar year 2021 at 50 percent[2]. Treat 50 percent as the operating figure and confirm the current year before building the pool.
When can the Coast Guard lower the random rate to 25 percent?
Only on two consecutive years of data. 46 CFR 16.230(f)(2) allows the Commandant to lower the rate from 50 percent to 25 percent where data received under the reporting requirements of 46 CFR 16.500 for two consecutive calendar years indicate that the positive rate is less than 1.0 percent[1]. Paragraph (f)(3) requires the rate to go back up to 50 percent if any calendar year comes in at or above 1.0 percent. The adjustment is a published decision, not a default.
Who counts as a covered crewmember for random testing?
It is decided by function, not by job title. On inspected vessels 46 CFR 16.230(a) covers anyone occupying or performing the duties of a position required by the Certificate of Inspection, patrolmen and watchmen required by the chapter, and anyone specifically assigned to warn, muster, assemble, assist or control passengers during emergencies. On uninspected vessels 16.230(b) covers anyone required to hold a Coast Guard credential, anyone performing duties directly related to safe operation, patrolmen and watchmen, and the same passenger control role[1].
How many types of chemical testing does 46 CFR part 16 require?
Five. Pre-employment and periodic testing under 16.220, random testing under 16.230, serious marine incident testing under 16.240 which points to 46 CFR subpart 4.06, reasonable cause testing under 16.250, and return to work testing under 16.201(f)[1][3][4][5][6]. Operators commonly run the first three and leave reasonable cause and return to work undocumented, because both require a written judgement rather than a scheduled event.
Can a master be employed if the random testing programme is not running?
No. 46 CFR 16.230(k) provides that an individual may not be engaged or employed, including self-employment, on a vessel in a position as Master, operator, or Person in Charge for which a credential is required by law or regulation unless all crewmembers covered by the section are subject to the random testing requirements[1]. A programme failure ashore therefore becomes a personal employment bar on the individual in that seat.
What does a Medical Review Officer do in a maritime drug testing programme?
A physician reviews the result before it becomes a finding. Laboratory reports go to a Medical Review Officer meeting 49 CFR 40.121, who reviews any positive and determines whether a legitimate medical explanation exists[7]. After a failure, 46 CFR 16.201(f) requires the MRO to determine that the individual is drug free and that the risk of subsequent use is sufficiently low to justify a return to work, with a minimum of six unannounced tests in the first year and up to a total of 60 months of additional testing at the MRO’s determination[6].
What records must a marine employer keep?
Enough to answer for the whole year, in the employer’s own file. 46 CFR 16.260 requires employers to maintain records of chemical tests as provided in 49 CFR 40.333 and make them available to Coast Guard officials upon request, and the records must identify the total number of individuals tested annually in each category of testing, the number failing, and the number and types of drugs for which individuals tested positive[8]. Using a consortium does not move that duty; the consortium holds data, the marine employer owes the answer.
