Criminal Offenses - As enacted, clarifies, for purposes of criminal offenses relative to threats of mass violence on school property or at a school-related activity or failing to report such threats, that a threat of mass violence is credible if the threat causes another to reasonably expect the commission of an act of mass violence. - Amends TCA Title 39.

HB 1273 creates a new felony charge for recklessly threatening mass violence against child care centers, preschools, or religious institutions, and a misdemeanor for failing to report such threats. The law requires immediate reporting of threats to both local law enforcement and the affected institution, with specific details needed in the report. Violators face penalties including up to 6 years in prison for the felony threat and up to 6 months for failing to report. The bill defines "property" to include buildings and grounds of these institutions and mandates restitution for disruption caused by threats.