Aurora shooter’s gun permit was revoked but weapon wasn’t seized

AURORA, Ill. — An initial background check failed to detect a felony conviction that would have barred the man who killed five co-workers and wounded six others at a suburban Chicago manufacturing plant from buying the gun.
Months later, a second background check of Gary Martin found his 1995 aggravated assault conviction in Mississippi involving the stabbing of an ex-girlfriend. But it prompted only a letter stating his gun permit had been revoked and ordering him to turn over his firearm