http://www.reuters.com/article/us-texas-guns-idUSKCN10C2FS "A new law went into effect in Texas on Monday that allows certain students to bring guns into classrooms, with supporters saying it could prevent mass shootings and critics saying the measure will endanger safety on campuses. The so-called state "campus carry" law allows people 21 and older with a concealed handgun license to carry pistols in classrooms and buildings throughout public colleges, including the University of Texas system, one of the nation's largest with an enrollment of more than 214,000 students. The law allows private colleges to opt out, and most of the state's best-known private universities have done so, saying the measure runs counter to protecting student safety. "There are so many students battling the stress of campus. Some are unstable and we don't know who has a gun," said Dang."