BOGOTA, Colombia — Gustavo Petro was imprisoned as a rebel in the 1980s on a weapons conviction. As Bogota's new mayor, he wants to get firearms off the streets of this city where the conspicuous display of guns has long been the norm. So he's trying an experimental ban on gun-wielding in public. The only people authorized to carry weapons during the 90-day trial that began Wednesday are active and retired police and soldiers, bodyguards of diplomats, politicians,... (GunPolicy.org)