Besides the chemical testing of a mariner's breath for alcohol, what other specimen testing for alcohol is acceptable to be taken onboard the vessel after a Serious Marine Incident?

Correct Answer: Option C — Saliva

46 CFR § 4.06-15 authorizes the use of breath or saliva testing to determine alcohol concentration following a Serious Marine Incident. These methods provide immediate, non-invasive results, allowing the Master or investigating officer to quickly assess potential impairment in accordance with established USCG chemical testing protocols for commercial mariners.