ATF agents conducting sting let man leave store with gun

So, what was this? Professional courtesy?'

ATF agents let a man armed with a gun and threatening to shoot someone walk out of their storefront sting operation in Milwaukee last summer, failing to arrest him or take the weapon, the Journal Sentinel has learned.

The suspect, Bobby Ball - a felon with a violent history - promised to return to the store and sell the agents that gun and others but he never came back, according to sources familiar with the case. Instead he spent four months on the loose, until he was picked up in Minnesota on a drunken-driving arrest.