Texas laws allow teachers to carry guns on school grounds with little regulation

Watch the CBS Reports documentary "Guns in the Classroom" in the video player above, or stream the premiere on Thursday, Nov. 17, at 8 p.m., 11 p.m. or 2 a.m. ET on the free CBS News app.

Since January, 50 people have been killed and 122 injured in at least 152 incidents of gunfire on school grounds across the U.S. To respond to the threat of such attacks, some districts — in at least 29 states that allow it — have taken the controversial step of authorizing school staff, other than security guards, to carry firearms on campus. Texas is one of those states.