Ariz. Rev. Stat. § 38-781
C. ASRS may:
J. A political subdivision or a political subdivision entity that is not participating in ASRS may elect to allow its employees to participate in a supplemental employee deferral plan that is overseen by ASRS pursuant to this section by entering into an agreement with ASRS. An employee of a political subdivision or a political subdivision entity who is participating in a public retirement system established by article 3, 3.1, 4, 4.1 or 6 of this chapter is not eligible to participate in a supplemental employee deferral plan pursuant to this section. A political subdivision or political subdivision entity that elects to allow its employees to participate in a supplemental employee deferral plan pursuant to this subsection:
K. For the purposes of this section: