The mass shooting at Virginia Tech, which killed 32 people three years ago Friday, touched off an intense debate over whether colleges should remain gun-free zones, or whether allowing students and faculty to carry concealed weapons might have resulted in fewer deaths. Though the debate continues, so far colleges have generally declined to move to allow concealed guns on campus – and most state legislatures have not forced them to do so. Today 26 states prohibit... (GunPolicy.org)