I dunno, maybe in this case. But people commit felonies all day every day. It being a felony doesn't seem to stop them.Quote from RedDuke:
...The felon who shot 2 firefighters, did not have any means to buy it on black market, instead his neighbor bought it for him. If the background check law was in place, she would have been made aware that selling or giving a gun to someone without passing an background check is a felony, and it would most probably deter her.