Confiscated: Parents Report Kids' School Lunches Taken Away By Teachers
Begin the investigation by asking if this happens to other children, if not, it is racism, or sexism and you need to file an appropriate complaint, before proceeding with federal civil rights actions, among others. If it does happen to others this is a RICO theft case, as well, file RICO complaint as needed. It's election season, so sue early, and often.
Sending children to public schools is parental malpractice.