The Orange County (Fla.) school district will begin screening students using metal detectors in hopes of preventing unsafe behavior at its 184 schools. The Orlando Sentinel reports that the district announced its plan shortly after a student at a district high school was arrested after authorities found a loaded handgun in his backpack. The incident was the fourth in as many months involving weapons at area schools. The schools where checks will conducted will be randomly selected from day to day. The screenings will continue at least until June 5, when the school year ends. The district hasn't decided whether the screenings will resume during summer school or into 2013-14.