Clinton claims that background checks have stopped 2.4 million dangerous or prohibited people from buying a gun. But what she really means is that there were 2.4 million "initial denials." About 96 percent of "initial denials" are errors, and dropped after the first two stages of review, with more dropped during the three remaining stages. But the Obama administration has ended those reviews, which means nearly all initial denials are likely still mistakes - just never corrected.