The Brady Bill requires every gun store to run a background check with the FBI before someone can purchase a gun. But if the FBI sees something they need to investigate further they only have 3 DAYS to take action, otherwise the sale can proceed. This loophole allowed a shooter in Charleston, SC to purchase a gun and go into a church in kill 9 people. It also allows for more than 3,000 guns to be sold yearly to people who are known to be severely mentally ill or dangerous criminals.