(a) For purposes of this section, the following terms have the following meanings:
(1) “Vote by mail ballot drop box” means a secure receptacle established by a county or city and county elections official whereby a voted vote by mail ballot may be returned to the elections official from whom it was obtained.
(2) “Vote by mail ballot drop-off location” means a location consisting of a secured vote by mail ballot drop box at which a voted vote by mail ballot may be returned to the elections official from whom it was obtained.
(b) On or before January 1, 2017, the Secretary of State shall promulgate regulations establishing guidelines based on best practices for security measures and procedures, including, but not limited to, chain of custody, pick-up times, proper labeling, and security of vote by mail ballot drop boxes, that a county elections official may use if the county elections official establishes one or more vote by mail ballot drop-off locations.