AP reports:

Authorities dropped charges Friday against an aide to Virginia Sen. Jim Webb who carried a loaded gun into the U.S. Capitol complex.

"After reviewing and analyzing all of the evidence in the case, we do not believe the essential elements of the crime of carrying a pistol without a license can be proved beyond a reasonable doubt," U.S. Attorney Jeff Taylor, top prosecutor in the District of Columbia, said in a short statement.

Webb senior aide Phillip Thompson, 45, was arrested on March 26 after Capitol Police spotted the loaded pistol and two other loaded magazines in a briefcase being scanned by an X-ray machine at the entrance of the Russell Senate office building.... Webb told reporters Thompson had carried the gun into the building "completely inadvertently."

Thanks to Dan Gifford for the pointer.