Indiana Code Title 29. Probate § 29-2-16.1-6

(1) a record signed by:

(2) the individual's will, including if the will is admitted to probate or invalidated after the individual's death;  or

(3) any form of communication made by the individual during the individual's terminal illness or injury to at least two (2) adults, and one (1) of the adults must be a disinterested witness.

(1) be witnessed by two (2) adults, at least one (1) of whom is a disinterested witness, who are witnesses at the request of the donor or the other person acting at the direction of the donor;  and

(2) state that the record has been signed and witnessed as described in subdivision (1).

(1) in the manner described in subsection (a);

(2) by subsequently making an anatomical gift under section 4 of this chapter that is inconsistent with the refusal;  or

(3) by destroying or cancelling the record evidencing the refusal, or the portion of the record used to make the refusal, with the intent to revoke the refusal.