Sec. 3. (a) This section applies under the following statutes:
(1) IC 12-26-6.
(2) IC 12-26-7.
(3) IC 12-26-12.
(4) IC 12-26-15.
(b) The individual alleged to have a mental illness, each petitioner, and all other interested individuals shall be given an opportunity to appear at hearings and to testify.
(c) The individual alleged to have a mental illness and each petitioner may present and cross-examine witnesses at hearings.
(d) The court may receive the testimony of any individual.