§ 91.19 Carriage of narcotic drugs, marihuana, and depressant or stimulant drugs or substances.
(a) Except as provided in paragraph (b) of this section, no person may operate a civil aircraft within the United States with knowledge that narcotic drugs, marihuana, and depressant or stimulant drugs or substances as defined in Federal or State statutes are carried in the aircraft.
(b) Paragraph (a) of this section does not apply to any carriage of narcotic drugs, marihuana, and depressant or stimulant drugs or substances authorized by or under any Federal or State statute or by any Federal or State agency.
Since NetJets expects its flight crews to follow all federal regulations I would call dispatch (radio, sat phone, whatever) and tell them we need to divert and why. If you don't tell anyone you are opening yourself up to certificate action (and maybe more) should anything happen. What if after the pax leave you get ramped and the plane smells like weed? What if they get into the terminal and drop their bag in front of airport security and a joint falls out? What if something slips under a seat or behind a panel only to surface when a CBP officer comes up after a trip from Mexico? You're betting your job and the company's reputation that nobody finds out. Not the kind of risk I want to take. When it comes to doing something blatantly illegal that puts you and your livelihood at risk I don't think you owe the pax any special considerations. I would of course handle the situation in a calm and professional manner, buy they would get no sympathy from me when the cops take them away in handcuffs. What you do in your own home is one thing, what you do in the back of my airplane is another.