The US Supreme Court has declined to hear an appeal of a lower court ruling upholding a ban on guns in US Post Office buildings and parking lots.
http://abcnews.go.com/Politics/wireStory/high-court-rejects-appeal-ban-guns-post-offices-37810287
The case involved Colorado resident Tab Bonidy, who has a permit to carry a concealed handgun. He sought a court order striking down the regulation after learning he would be prosecuted for carrying his gun while picking up mail at his local post office or leaving it in his car.
http://abcnews.go.com/Politics/wireStory/high-court-rejects-appeal-ban-guns-post-offices-37810287