Quick Legal Facts Statewide Preemption: No. Concealed Carry: Not an issue. Schools: Possession of weapon in or upon any part of the buildings or grounds of any school, college, university or other educational institution, under circumstances not manifestly appropriate for its lawful use, is guilty of a crime of the fourth degree. Critical Dimensions: 5 or more blade length, 10 inches maximum overall length limits on knives that may be sold to minors. Restricted Knives: Gravity knives, automatic knives, dirks, daggers, stilettos, and ballistic knives are subject to significant restriction. New Jersey law prohibits the possession “without any explainable lawful […]