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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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The Buffalo suspect was taken to a hospital last year for a mental health evaluation, but the incident didn't trigger New York's "red flag" law and he was still able to purchase a gun. The Texas suspect's mother told ABC he gave her an "uneasy feeling" at times and could "be aggressive ... If he really got mad." But authorities say he had no known criminal or mental health history. The state has no such red flag law.