Under what circumstances can a private pilot carry a passenger who is under the influence of drugs?

A private pilot may carry a passenger who is under the influence of drugs only in an emergency situation due to the critical nature of protecting both the passenger and the safety of the flight. During emergencies, the pilot's primary responsibility is to ensure the safety of everyone onboard, and there may be instances where a passenger under the influence poses a risk to their own well-being or to the operation of the aircraft.

It is important to note that carrying a passenger under the influence outside of an emergency situation would not comply with regulations and safety standards set for private pilots. Other options imply circumstances (like waivers or documentation) that do not align with aviation regulations, which prioritize safety above all in aviation operations. The regulatory framework aims to minimize risk, ensuring that both pilots and passengers are capable of handling the demands of flight.