Because weapons can be easily car­ried across state lines, states that try to impose tight con­trols on gun pur­chases can be undercut by other states that are more per­mis­sive, ana­lysts say.

There’s no metal detec­tors at the bor­ders,” said North­eastern Uni­ver­sity crim­i­nol­o­gist James Alan Fox. “Any state’s ability to deal with the gun problem is lim­ited by that fact: They’re not iso­lated islands.”

Gun-​​control advo­cates say that’s one reason Con­gress needs to strengthen fed­eral back­ground checks of prospec­tive gun buyers, limit the size of mag­a­zine clips and ban military-​​style “assault” weapons.

Read the article at Reuters →