Polls show that expanding background checks to cover all gun sales, not just those by licensed dealers, is one of the most popular measures being considered by the White House to curb gun violence.

There's one problem: The system President Barack Obama and many lawmakers hope to expand is full of holes.The National Instant Criminal Background Check System, which federally licensed firearm dealers must use to check the credentials of potential gun buyers, doesn't include millions of people legally barred from owning guns, researchers and advocates say. Fourteen states list fewer than five people flagged for mental-health issues.

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