Ariz. Rev. Stat. § 5-234
If a contest is held within the corporate limits of a city or town, the promoter shall request that the chief of police assign not less than one officer to attend the contest, and if a contest is held outside the corporate limits of a city or town, the promoter shall request that the county sheriff assign not less than one of the sheriff's deputies to attend. The officer or deputy shall be charged with the duty of preventing disturbances amounting to breach of the peace by spectators. The cost of providing such officer or deputy shall be paid by the promoter. If law enforcement officers or sheriff's deputies are not available to attend the contest, the commission may grant the promoter permission to use private security services to attend the contest.
A.R.S. § 5-234