One has to wonder about the legitimacy and effectiveness of said background check, as numerous violent criminals have passed it with flying colors, then went on to murder innocent, defenseless people, who did them no harm. It's also ironic that the people the FBI are supposed to watch, they don't and who they aren't supposed to watch, they do. Hence, so many grievous crimes getting through, rather than being intercepted, by an agency wasting taxpayer money spying on the wrong folks.