Ariz. Rev. Stat. § 16-803
B. Within seven business days after receiving a petition for statewide recognition, the secretary of state shall:
1. Review each sheet to determine the county of the majority of the signers and shall:
2. Remove the following signatures that are not eligible for verification by marking an "SS" in red ink in the margin to the right of the signature line:
C. The secretary of state, during the same seven business day period provided in subsection B of this section, shall select, at random, twenty percent of the total signatures eligible for verification by the county recorders of the counties in which the persons signing the petition claim to be qualified electors. The random sample of signatures to be verified shall be drawn in such a manner that every signature eligible for verification has an equal chance of being included in the sample. The random sample produced shall identify each signature selected by petition page and line number. The signatures selected shall be marked according to the following procedure:
E. Within ten business days after receiving the facsimile signature sheets from the secretary of state, the county recorder shall determine which signatures of individuals whose names were transmitted shall be disqualified for any of the following reasons:
F. Within the same time period provided in subsection E of this section, the county recorder shall certify to the secretary of state the following:
G. At the time of the certification, the county recorder shall:
H. Within seventy-two hours after receiving the facsimile signature sheets and the certification of each county recorder, the secretary of state shall determine the total number of valid signatures by subtracting from the total number of eligible signatures in the following order: