Sec. 11. (a) A final hearing required by section 9 of this chapter shall be held not later than fourteen (14) days from the date of the individual's admission to a facility, excluding Saturdays, Sundays, and legal holidays. The purpose of a final hearing is to determine by clear and convincing evidence whether the individual is:
(1) mentally ill and either dangerous or gravely disabled; and
(2) in need of temporary or regular commitment.
(b) At a final hearing, an individual may not be found in need of temporary or regular commitment unless:
(1) the physician who signed the attestation under section 1 of this chapter; or
(2) at least one (1) physician who has personally examined the individual;
testifies at the hearing. This testimony may be waived by the individual if the waiver is voluntarily and knowingly given.