Where must a weapon be placed on a law enforcement officer not in uniform?

A weapon must be placed on a law enforcement officer who is not in uniform on their person or in a location that is accessible but out of view. This procedure ensures that the officer can maintain control over their weapon while also adhering to safety and security protocols. Keeping the weapon accessible allows the officer to respond quickly in case of an emergency, which is crucial in their line of duty.

Furthermore, the requirement that the weapon be out of view is critical for passengers' safety and for creating a non-threatening atmosphere. This helps to prevent panic or confusion among travelers who might see an openly carried weapon, especially if they are unaware that a law enforcement officer is present. The other options do not align with the standard practices regarding the handling of firearms by law enforcement in a transportation setting. For instance, placing the weapon in a carry-on bag or under a seat could potentially allow for unauthorized access, and storing it in the cargo hold removes the immediate accessibility needed in emergencies.