Reply #5: Here's an interesting case to consider...

[derby378]

A Texas gun dealer named Thomas Bean went to Laredo, Texas, for a gun show. On Saturday night, after instructing his assistants to empty his Suburban of all guns and ammo, he drove himself and his three assistants across the border into Nuevo Laredo for dinner.

Upon crossing the border, the Mexican authorities discover approximately 200 rounds of overlooked ammo in the back of the Suburban.

Bean was arrested and sentence to five years imprisonment in Mexico for bringing the ammo into Mexico...

Bean was released shortly after the transfer, but under US law he is considered a felon because of the overlooked 200 rounds. Although he was not breaking US law in having the forgotten ammo in the back of his vehicle, the government took away his FFL and his right to possess firearms.

http://www.burger.com/gunbean.htm