TSA: U.S. Travelers Keep âForgettingâ They Packed Loaded Guns Share to Facebook getty Some travelers forget sunscreen. Others neglect to put their mail on hold or water their plants. And, for certain travelers, it completely escapes their memory that they packed loaded guns in their carry-on bags. Forgetfulness is the most common excuse provided when Transportation Security Administration (TSA) screeners discover a gun at an airport security checkpoint. In an example from just last Sunday, a Maryland resident told law enforcement officers at Baltimore/Washington International Thurgood Marshall Airport (BWI) that he forgot his loaded 9mm semi-automatic handgun was in his carry-on luggage after TSA screeners spotted it inside the checkpoint X-ray machine. The man was cited on weapons charges and also faces a stiff federal financial penalty.