Dylann Roof Bought A Gun Because Federal Background Check Failed.

We actually do have gun control laws in place, but the Federal government doesn't do the work required for them to be effective. It's easy to scream "gun control" when a mass murder happens, but months later, the FBI now admits the current law should have prohibited this punk from legally buying his gun

https://www.washingtonpost.com/world/national-security/fbi-accused-charleston-shooter-should-not-have-been-able-to-buy-gun/2015/07/10/0d09fda0-271f-11e5-b72c-2b7d516e1e0e_story.html