Section 15101 Of Chapter 2. Vote By Mail Ballot Processing From California Elections Code >> Division 15. >> Chapter 2.

. (a) Any jurisdiction in which vote by mail ballots are cast may begin to process vote by mail ballot return envelopes beginning 29 days before the election. Processing vote by mail ballot return envelopes may include verifying the voter's signature on the vote by mail ballot return envelope pursuant to Section 3019 and updating voter history records.
  (b) Any jurisdiction having the necessary computer capability may start to process vote by mail ballots on the 10th business day before the election. Processing vote by mail ballots includes opening vote by mail ballot return envelopes, removing ballots, duplicating any damaged ballots, and preparing the ballots to be machine read, or machine reading them, but under no circumstances may a vote count be accessed or released until 8 p.m. on the day of the election. All other jurisdictions shall start to process vote by mail ballots at 5 p.m. on the day before the election.
  (c) Results of any vote by mail ballot tabulation or count shall not be released before the close of the polls on the day of the election.