This is the case because according to the Supreme Court, the federal government cannot mandate that states carry out or enforce federal statutes like the Brady Bill.
The Brady Handgun Violence Prevention Act, on the 30th day of November, 1993 was enacted, thus effectively modifying or amending it's predecessor - the Gun Control Act of 1968.
This new Act required that everyone who wanted to be armed must wait for five days before a dealer sold a handgun to an individual that is unlicensed.
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