Buying a gun from a dealer – say, a sporting goods store – triggers a federal background check. If you’re a convicted felon, you would fail the background check. So, too, if you’ve been involuntarily committed to an institution or otherwise ruled mentally ill. But the federal database against which background checks are run is only as good as the data. And Rhode Island is one of only four states that haven’t submitted any mental health records at all, according to a recent report out from a group called Mayors Against Illegal Guns.