School Safety; Requires sheriffs to assist public postsecondary educational institutions in implementing guardian programs under certain provisions; authorizes public postsecondary educational institutions to participate in the school guardian program; requires a sheriff to establish a guardian training program or contract with certain other sheriff's offices to do so in certain circumstances; creates the offense of discharging a weapon or firearm within 1,000 feet of a school; provides that a person arrested for certain offenses must be held in custody until brought before the court for admittance to bail; ranks an offense created by the act on the offense severity ranking chart of the Criminal Punishment Code; authorizes the State Board of Education and the Board of Governors to adopt rules and regulations, respectively, etc.