Gun Control Debate Clouds Definition of Mentally Ill

Some states have already set their parameters as the Senate soon takes up its own bill.

Customers line up at the gun counter at Duke's Sport Shop on Tuesday, Jan. 15, 2013, in New Castle, Pa.

Customers line up at the gun counter at Duke's Sport Shop in January in New Castle, Pa.

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Corrected on : This story has been updated to add context to Josh Horwitz’s quote.