Proponents presented Proposed Initiative 66 at an April 4 review hearing proposing that voters returning mail ballots must sign and provide either the last four digits of their Social Security number or the last four digits of a state-issued identification number on the ballot return envelope self-affirmation. The measure would also require matching that information against a "voter file." Reviewers included Amanda King and representatives from the Office of Legislative Legal Services; proponents included Suzanne Taheri and Michael Fields.

Staff focused on implementation details. They asked which forms of identification qualify as "state issued identification" (the proponents said they intended driver's-license or state ID numbers only), whether the initiative would disallow the statutory option to make a mark (an "X") witnessed by another person when an individual cannot sign, and how election judges would access and verify the asserted last-four-digit information against voter-file records.

Proponents said they did not intend to require nonstandard identification (for example, the last four digits of a utility bill) and agreed to clarify that the acceptable identification numbers are the identifying number on a driver's license or state-issued ID. Staff also urged proponents to add an applicability clause clarifying which elections the amendment would cover and whether county clerks and recorders or other designated election officials are covered when the clerk is not the designated official.

Questions also covered rules for curing a discrepancy in the self-affirmation, safeguards for storing personal identifying information on return envelopes, and whether the Secretary of State should have rulemaking authority to administer and enforce the provision. Proponents acknowledged the technical questions but said some implementation specifics would be addressed in statute or rule if the constitutional amendment were adopted. The advisory hearing ended with staff indicating technical comments in the memo for proponents to consider.