Final answer:
A pilot must address the situation following aviation and airline policies if they suspect a passenger is under the influence of marijuana, which can involve denying boarding or reporting to security.
Step-by-step explanation:
If a pilot suspects that a passenger boarding an aircraft is under the influence of marijuana, it is a serious concern that must be addressed following specific aviation and airline policies. Pilots have the authority and responsibility to ensure the safety and security of all their passengers. If they believe a person is too impaired to fly safely, they must take appropriate steps. This could involve denying the individual from boarding the plane, reporting the situation to airport security, or following the airline's established protocols for such situations. Pilots are trained to handle a variety of in-flight situations, including those related to passenger behavior and potential impairment. It's critical for pilots to make judgment calls that prioritize the safety of the flight, which is why they have strict guidelines and support systems in place for these determinations.