Sec. 2. (a) A commitment under this chapter may be begun by any of the following methods:
(1) Upon request of the superintendent under IC 12-26-3-5.
(2) An order of the court:
(A) having jurisdiction over the individual following emergency detention; or
(B) referring an individual:
(i) following a hearing under IC 35-47-14-6; and
(ii) after a physicians written statement has been filed setting forth the requirements described in subsections (c)(1) and (c)(2) of this section.
(3) Filing a petition with a court having jurisdiction in the county:
(A) of residence of the individual; or
(B) where the individual may be found.
(b) A petitioner under subsection (a)(3) must be at least eighteen (18) years of age.
(c) A petition under subsection (a)(3) must include a physician's written statement stating both of the following:
(1) The physician has examined the individual within the past thirty (30) days.
(2) The physician believes the individual is:
(A) mentally ill and either dangerous or gravely disabled; and
(B) in need of custody, care, or treatment in an appropriate facility.