Indiana Code Title 3. Elections § 3-11-13-30

(1) use only the marking device provided for marking the cards and that the voter is not to mark a card in any other way;

(2) be certain that the initials of the poll clerks appear on the voter's card and that if the initials are not on the card it will not be counted, except as provided by IC 3-12-1-12;  and

(3) place the voter's card in an envelope after the voter has voted or to fold the card in a manner so that no card is exposed upon which a choice is indicated.