More on the Charleston killer
Eugene Volokh thinks FBI director was wrong, the shooter actually wasn't a prohibited buyer. If so, it is interesting that our gun laws are so vague that even the Director of the FBI can't get them right.
The Gun Control Act's prohibited person category does have an ambiguity. It bars gun receipt and possession by those who are illicit users of controlled substances. But, except in those cases where the defendant is caught with both drugs and a gun at the same moment, this gets murky. Does he have to be using the drugs at the moment he possessed the gun?