Arizona's private schools are free to allow concealed-carry licensees to carry guns on school premises

So says Arizona Attorney General Mark Brnovich, in a formal opinion:

State and federal law do not prohibit an individual that holds an Arizona Concealed Carry Weapons Permit from carrying a concealed handgun on private school grounds in Arizona. Additionally, State and federal law permit individuals to possess firearms in school zones for use in a program approved by the private school….

Although [Arizona] law allows individuals to carry concealed without a permit, Arizona continues to offer [concealed carry licenses]. Licensure provides certain benefits to the individual, including reciprocity for concealed carry with other states. Per the Arizona Department of Public Safety, as of June 26, 2016, there were 273,186 active CCWs.

https://www.washingtonpost.com/news/volokh-conspiracy/wp/2016/09/12/arizonas-private-schools-are-free-to-allow-concealed-carry-licensees-to-carry-guns-on-school-premises/?utm_term=.7cbec8385f17