The 1,000' radius is a Federal Law. Not a state law. And I think (this is why you take a class from a certified trainer) I think it only applies to a K-12 school.
The problem is that it's a mix of state and federal law. Federal code makes it illegal but gave an exemption based on specific state laws. The conclusion GT gave you is accurate.
Because it is confusing the Arizona state Attorney General was asked to give an opinion. The opinion from September, 2016 is several, pages long, is in response to a question about private schools but the answer deals with all schools, and it has all of the cites of Arizona statutes, Federal codes and court rulings that apply. I cut and pasted the portion of the AG's opinion that applies to 2 circumstances a CCW holder on school grounds, K-12 and a person taking a CCW class, or other firearms class (an enrolled student) on school grounds. If you like legalese, read it all, if not skip to the conclusion at the end. I tried to
BOLD the important parts and I included a link to the letter at the end:
The Federal Gun Free School Zones Act (“GFSZA”) makes it unlawful for “any individual knowingly to possess a firearm that has moved in or that otherwise affects interstate or foreign commerce at a place that the individual knows, or has reasonable cause to believe is a school zone.” 18 U.S.C. § 922(q)(2)(A). The GFSZA does not distinguish between private and public schools and defines a school zone as either “in or on the grounds of a public, parochial or private school” or “within a distance of 1,000 from the grounds of a public, parochial or private school.” Id. at (a)(25).
The GFSZA’s prohibition against knowingly possessing a firearm in a school zone does not apply to the possession of a firearm “if the individual possessing the firearm is licensed to do so by the State in which the school zone is located . . . and the law of the State . . . requires that, before an individual obtains such a license, the law enforcement authorities of the State . . . verify that the individual is qualified under law to receive the license.” Id. at (q)(2)(B)(ii). Finally, the GFSZA’s prohibition against knowingly possessing a firearm in a school zone also does not apply to possession of a firearm “by an individual for use in a program approved by a school in the school zone.” Id. at (q)(2)(B)(iv).
Under Arizona law, a person commits “misconduct involving weapons” by knowingly “possessing a deadly weapon on school grounds.” A.R.S. § 13-3102(A)(12). As with the GFSZA, “school grounds” under this statute includes private schools. See A.R.S. § 13-3102(N)(4) (defining school as “a public or nonpublic kindergarten program, common school or high school” and school grounds as “in, or on the grounds of, a school”).
Arizona law also includes exemptions for “[a] person specifically licensed, authorized or permitted pursuant to a statute of this state or of the United States,” Id. at 3102(C)(4), and possession of a “firearm for use on the school grounds in a program approved by a school,”3 Id. at 3102(I)(2).
Analysis
Arizona CCW permittees are not legally prohibited from carrying a concealed handgun on private school grounds in Arizona. Individuals may also carry a firearm under a program approved by a private school. With regard to federal law, the GFSZA exempts individuals “licensed . . . by the State” from the blanket prohibition of knowing possession of a firearm in school zones. Id. at (q)(2)(B)(ii). The meaning of “licensed” possession in the GFSZA is not explicitly defined in the statute, but that term includes both POST certification and state-issued CCWs if “the law of the State . . . [requires verification] that the individual is qualified under law to receive the license.” United States v. Tait, 202 F.3d 1320, 1324 (11th Cir. 2000). In Tait, the Eleventh Circuit held that a defendant’s possession of a firearm in a school zone was not subject to prosecution under the GFSZA because he held an Alabama CCW permit. Id. at 1323–25. Arizona’s CCWs are only issued to applicants who are not “prohibited possessor(s) under state or federal law.” A.A.C. R13-9-201(A). Accordingly, the GFSZA does not prohibit Arizona CCW permittees from carrying weapons on private school grounds.
The analysis is much the same under Arizona law. While there is a general prohibition for possessing a deadly weapon on school grounds, including private school grounds, A.R.S. § 13-3102(A)(12), those who are “licensed, authorized or permitted” to carry firearms under State or federal law are exempt, id. at 3102(C)(4). POST certification and an Arizona CCW are two such State permits. Accordingly, Arizona law does not prohibit CCW permittees from carrying concealed weapons on private school campuses. Additionally, Arizona law exempts firearms possessed by an individual for use in a program approved by a school. Id. at 3102(I)(2). Thus, if an Arizona private school were to initiate a program enrolling trained firearm handling persons in a program through which these persons would be allowed to carry concealed on school grounds, Arizona’s prohibitions would not apply to those enrolled individuals.
Conclusion
Arizona CCW permittees may carry concealed firearms onto private school grounds and otherwise properly store them on school property. Individuals may also possess a firearm on private school campuses pursuant to a program approved by the school. Private schools may also securely store firearms on campus that trained firearm handling employees may access.
Mark Brnovich
Attorney General https://www.azag.gov/sites/default/files/R15-024%2C%20I16-009%20Opinion.pdf