§ Ind. Code § 3-12-1-4Ballot void for extrinsic act; erasures

(a) The whole ballot is void if a voter does any act extrinsic to the ballot, such as
enclosing any paper or other article in the folded ballot, with the intent to enable a person to
determine that the voter cast the ballot.
(b) An erasure by a voter does not make the whole ballot void unless made with the intent
to enable a person to determine who cast the ballot, but it does not register a vote for the
elected office, political party office, or public question for which it is made.