Local Education Agencies - As enacted, conditions the expulsion of a student for committing the zero tolerance offense of threatening mass violence on school property or at a school-related activity to threats of mass violence determined to be valid based on the results of a threat assessment; requires directors of schools and heads of public charter schools to report threats of mass violence on school property or at a school-related activity made by a student that are determined, based on the results of a threat assessment, to be valid. - Amends TCA Title 39 and Title 49, Chapter 6.