SAN MARCOS, Texas -- Violence on college campuses is a growing concern among students, and some say it's time to take protection into their own hands -- by carrying guns. Mike Guzman, a senior at Texas State University-San Marcos, is among 30,000 members of Students For Concealed Carry on Campus, a group dedicated to a nationwide effort to make it legal for students to carry concealed handguns on campus, San Antonio television news station KSAT reported. "It's a tool that we're allowed to use across the street in larger society, so why not on campus?" Guzman said. Concealed handguns may...