How Did Nikolas Cruz Legally Buy an AR-15?

19-year-old Nikolas Cruz legally bought an AR-15 he then used to allegedly kill at least 17 and injure 14 in one of the deadliest school shootings in US history.??????According to CNN and the NY Times, Cruz suffered from depression, was expelled from school, bragged about killing animals, posted violent photos to social media, and even had classmates worried he would do something violent.????SOT??“He was a troubled kid”????So how is it possible that this quote..“troubled kid” with reportedly a history of mental illness was able to buy a semi-automatic weapon legally.????Well for starters, in most states where it is legal to buy a gun even a semi-automatic weapon one, it’s quite simple.??????According to business insider, Florida doesn’t require fingerprints, a special permit and doesn’t have a waiting period to buy a gun, which are all common precautions taken in some parts of the US.????In most states, stores will run state and federal background checks with nearly instantaneous results, but even though Cruz had been in and out of mental health treatment..according to the Miami Times, a judge would have had to declare him mentally unfit to own a gun, for him to fail the test.??????Last February, President Trump signed into law rolling back obama-era regulation that made ??it harder for people with mental illness to buy a gun.??