School Safety; Authorizes public postsecondary educational institutions to participate in school guardian program; requires sheriffs to assist such institutions in implementing guardian programs under certain provisions of law; requires such institutions to provide specified notice to sheriff; creates offense of discharging weapon or firearm within 1,000 feet of school; provides exception; provides that person arrested for certain offenses must be held in custody until brought before court for admittance to bail; ranks offense created by act on offense severity ranking chart; requires that postsecondary institutions be made aware of mobile suspicious activity reporting tool in specified manner; requires public postsecondary educational institutions to promote use of such tool; requires transfer of specified educational records for certain students; requires State Board of Education & Board of Governors to adopt rules & regulations; requires certain trainings to include specified information relating to school safety; defines "public postsecondary educational institution"; authorizes such institutions to participate in certain programs & appoint certified school guardians; authorizes specified persons to serve as school guardians; requires such institutions to adopt specified emergency response plans, provide specified training, post specified information, & adopt threat management processes; authorizes State Board of Education & Board of Governors to adopt rules & regulations.