Glenn Pierce, the acting ­director of the Insti­tute for ­Secu­rity and Public Policy at North­eastern Uni­ver­sity, said that guns can easily be bought in some states from pri­vate sellers without any paper trail and that uni­versal back­ground checks would slow down the flow of guns to some people who should not have them.

The highly moti­vated, highly knowl­edge­able indi­vidual is more likely to beat the system even if it’s a little harder,” Pierce said. “We’re really looking at whether you can stop the less moti­vated individuals.”

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