A gun used by a felon to shoot and kill a state trooper in the state of Washington in February was traced to a gun show in 2009, the Associated Press reports.
The news comes from the ATF, which tracked the history of the .40-caliber Smith & Wesson.
The proper documentation was never filled out when the gun changed hands at least twice, according to the AP.
Joshua Blake shot and killed Trooper Tony Radulescu Feb. 23 and then fatally shot himself, the AP reported.
