What is considered a Serious Marine Incident?

Correct Answer: Option C — an injury to a crewmember, passenger, or other person which requires professional medical treatment beyond first aid

46 CFR 4.03-2 defines a Serious Marine Incident to include any injury to a crewmember, passenger, or other person that requires professional medical treatment beyond first aid. This classification triggers mandatory drug and alcohol testing requirements for individuals directly involved in the incident to ensure maritime safety and accountability.