A crewmember who previously failed a required chemical test for dangerous drugs seeks to return to work aboard a vessel. Under 46 CFR §16.201(f), which combination of conditions must be satisfied before the individual may return?

1. ✓ The MRO must determine the individual is drug-free and the risk of subsequent use is sufficiently low, and the individual must agree to a minimum of six unannounced tests in the first year of return, with possible additional testing up to 60 months as determined by the MRO.Correct
2. B. The individual must complete a 90-day inpatient rehabilitation program and pass a single return-to-duty test administered by a DHHS-certified laboratory.
3. C. The OCMI must grant written authorization for return to duty, and the individual must pass two consecutive negative drug tests at least 30 days apart.
4. D. The marine employer must certify in writing that the individual poses no safety risk, and the individual must pass a pre-employment test for the new employer.