(a) A person acquitted by reason of insanity may not be committed to a mental hospital or other inpatient or residential care facility or ordered to receive outpatient or community-based treatment and supervision under Subchapter F for a cumulative period that exceeds the maximum term provided by law for the offense for which the acquitted person was tried.
(b) On expiration of that maximum term, the acquitted person may be further confined in a mental hospital or other inpatient or residential care facility or ordered to receive outpatient or community-based treatment and supervision only under civil commitment proceedings.