Question: is it legal to have a knife at school

Answer: No, City, county, and local jurisdictions (to include sovereign Indian nations located within a state boundary) may enact their own criminal laws or ordinances in addition to the restrictions contained in state laws, which may be more restrictive than state law. Virtually all states and local jurisdictions have laws that restrict or prohibit the possession or carrying of knives in some form or manner in certain defined areas or places such as schools, public buildings, courthouses, police stations, jails, power plant facilities, airports, or public events.