Coat

Coat
It was a normal day at a normal airport. People are passing through the x-rays as usual. Then, a man in a trench coat arrives. When he passed through the x-ray, the alarm sounds. The police walk over to him, and they question if he brought a gun with him. The man replies, “No, I didn’t bring a gun. You can use your metal detectors to confirm me.” So, the police do, and alas! He was truthful. However, the police denied him access to the planes anyway.

Why would they do that?

Thank you A.J. for your submission!