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Mass shooters exploited gun laws, loopholes before carnage

The latest suspected U.S. mass shooters whose ability to obtain guns has raised concerns. In some cases shooters got guns legally under current firearms laws, or because of background check lapses or law enforcement's failure to heed warnings of concerning behavior.

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DAYTON, OHIO: AUG. 4, 2019. 9 DEAD Connor Betts' classmates said he was suspended in high school for compiling a "hit list" and a "rape list," but authorities said nothing in his background prevented him from purchasing the AR-15-style pistol used in the shooting at Ned Peppers Bar. Ohio law requires that sealed records of any juvenile crimes be expunged either after five years or once the offender turns 23. Betts, who was 24 at the time of the shooting, bought the gun online from a Texas dealer. It was then shipped to a Dayton-area firearms dealer, in accordance with federal law. Betts was killed by police.