From a press release by the Foundation for Individual Rights and Expression, whose descriptions and analyses of their cases I have generally found reliable:
Mere months after the Uvalde school district suspended its entire police force for failing to effectively respond to a deadly shooting at an elementary school, school officials banned a concerned parent from school property — because he questioned the qualifications of a new police hire.
Today, the Foundation for Individual Rights and Expression demanded the Uvalde Consolidated Independent School District lift its ban against Adam Martinez, a father of two students in the district. The district banned Martinez from all district property for two years, including from school board meetings. FIRE’s letter to UCISD threatens litigation if the district does not lift the unconstitutional ban by May 22, 2023.
… One of Martinez’s children was at Robb Elementary School on May 24, 2022, when a former student fatally shot 19 students and 2 teachers and injured 17 others. His child was physically unharmed. In the wake of the tragedy and police’s failure to enter the school building for over an hour, the school district fired its police chief and suspended its entire police force as it searched for qualified…
More information can be found here