Indiana Code Title 3. Elections § 3-11-4-19

Sec. 19. (a) Subject to IC 3-5-4-9, a ballot that is mailed must bear the circuit court clerk's official seal and signature or facsimile signature on the back of the ballot.  Before the ballot is mailed:

shall place their initials in ink on the back of the ballot.  The initials must be in the persons' ordinary handwriting or printing and without a distinguishing mark of any kind.  No other initialing of the absentee ballot is necessary.

(b) An absentee ballot that is voted before an absentee voter board under IC 3-11-10-25, IC 3-11-10-26, or IC 3-11-10-26.3, must bear the seal, signature, and initials prescribed by IC 3-11-10-27.

(c) An absentee voter board member or county election board member or the member's representative shall not place the individual's initials on the absentee ballot:

A ballot initialed under this subsection must be under the control of two (2) individual members or representatives of opposite political parties until the ballot is mailed to the voter.