Impersonation of police and FBI by criminals is apparently not uncommon in New York, according to a TV program last week. Occurs something like 1,000 cases a year, if I remember correctly. Police and FBI badges, as well as uniforms, can be bought on the internet. New York police badges are legal to possess so long as you are not in NY.
So what is to prevent a terrorist dressed as a police officer walking through security and passing weapons to others who are going to fly? Said "police officer" can have exited the airport before the attack is executed.
Surely the danger lies in the weapon, not in who currently has possession of the weapon.
Also, it is not uncommon for real police officers to be killed with their own guns. The gun is visible and available, and it's only too easy for a criminal to grab an officer's gun and shoot the owner. This also happens to homeoners trying to defend themseves against intruders into their homes. Could happen to a pilot, too, except the gun would not, in general, be so visible.
Cheers,
