Aaron Alexis

Mass shooters exploit lapses, limited laws to get guns

Texas church shooter Devin Patrick Kelley's history of domestic abuse barred him from legally buying guns, but he did so anyway because information about his crimes was never entered into a federal database used for background checks.

Kelley is just the latest recent U.S. mass shooter to amass weapons by exploiting lapses in the background check process or by taking advantage of limited weapons laws. Others have obtained guns while undergoing mental health treatment or got their hands on weapons that were initially purchased legally.

A look at some recent mass shootings, the number of deaths, and how the attackers obtained their guns:

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