Most common circumstances when an election official will ask a voter to cast a provisional ballot are:
First time voters: If the voter cannot provide proof of identification.
Vote-By-Mail voter who appears in person and does not relinquish their unvoted vote-by-mail ballot.
Voter has moved within County and did not re-register.
Voter who is not on the polling place roster for an unknown reason.
No provisional ballot is counted or precluded from being counted until the elections official goes through the detailed process to determine whether a voter's provisional ballot should be counted. (Elections Code sections 14310-14311, 15350, and 15100-15112.)
Provisional Voters may confirm the status of their provisional ballot through the following free access phone number: 866-327-0201