Under what circumstances can TAC Crew members conduct a vessel search?

TAC Crew members are authorized to conduct a vessel search primarily under two key legal frameworks: probable cause and consent from the operator. This means that if crew members have reasonable grounds to believe that a vessel is involved in illegal activity, they can initiate a search without explicit consent. Additionally, if the vessel operator gives their consent, a search can also be conducted. This standard ensures that TAC Crew operations are conducted lawfully while protecting the rights of individuals.

The other options do not reflect the legal standards governing vessel searches. Conducting a search solely when a vessel is abandoned does not align with the proactive enforcement measures that TAC Crew members are trained to implement. Similarly, the idea that searches can occur every time they see a vessel on the water is overly broad and would not uphold the legal standards of search and seizure. Lastly, the notion that crew members can search vessels whenever they feel it is necessary without restrictions ignores the fundamental principles of legal justification required for such actions. Thus, option B accurately represents the circumstances under which vessel searches may lawfully occur.