Ind. Code § 3-11-10-4

Sec. 4. (a) Upon receipt of an absentee ballot, a county election board (or the absentee voter board in the office of the circuit court clerk) shall immediately examine the signature of the absentee voter to determine its genuineness.

(b) This subsection does not apply to an absentee ballot cast by a voter permitted to transmit the voter's absentee ballots by fax or electronic mail under IC 3-11-4-6. The board shall compare the signature as it appears upon the envelope containing the absentee ballot with the signature of the voter as it appears upon the application for the absentee ballot. The board may also compare the signature on the ballot envelope with any other admittedly genuine signature of the voter.

(c) This subsection applies to an absentee ballot cast by a voter permitted to transmit the voter's absentee ballots by fax or electronic mail under IC 3-11-4-6. The board shall compare the signature as it appears on the affidavit transmitted with the voter's absentee ballot to the voter's signature as it appears on the application for the absentee ballot. The board may also compare the signature on the affidavit with any other admittedly genuine signature of the voter.

(d) If a member of the absentee voter board questions whether a signature on a ballot envelope or transmitted affidavit is genuine, the matter shall be referred to the county election board for consideration under section 5 of this chapter.