Customers who carry a concealed weapon into a bank could put others at greater risk of injury or death during a robbery, but only one U.S. state specifically prohibits carrying a concealed weapon inside a bank.
U.S. states have issued more than 11 million permits to carry a concealed weapon, according to a 2014 study by the Crime Prevention Research Center.
That's probably a conservative estimate. Four states -- Alaska, Arizona, Vermont and Wyoming -- and most of Montana don't require a permit, according to the center. The number of state-issued permits has been on the rise since 2012. And some people might choose to carry a concealed weapon without a permit even where one is required.
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