This information was updated in June 2013
Signed into law 2006, Arizona's audit law calls for one federal, one statewide, and one legislative contest to be audited, in addition to one ballot measure and the presidential contest.
Unless otherwise noted, all citations below are from the Arizona Revised Statutes, Section 16-602.
2% of the precincts in each county, or 2 precincts, whichever is greater. 1% of early ballots.
If a discrepancy equal or greater than the designated margin is discovered, a recount of the audited ballots will take place. If the recount verifies that discrepancy, then the audit will be expanded to include twice the orginal number of audited precincts for that county. If the expanded audit reveals a discrepancy equal or larger to the designated margin, the audit shall be further expanded to include the entire jurisdiction for the race in question.
See Section I.
"Arizona's precinct audit is a valid end-to-end audit because the hand count is checking a figure that appears in the final canvass. Our early (absentee) ballot audit, however, is not end-to-end because it checks randomly selected "batches" of mixed-precinct ballots and these batch counts do not appear in the canvass. So it checks the accuracy of the central count scanners, but not the election management software that collects and reports all the early ballot results. In order to do the latter properly, mail-in ballots would have to be sorted by precinct, something the election officials have refused to consider."