For purposes of this article:
(a) “Custody” shall be construed to mean involuntary detainment under the provisions of this part uninterrupted by any period of unconditioned release from a licensed health facility providing involuntary care and treatment.
(b) Conviction of a crime is not necessary for commitment under this article.
(c) Demonstrated danger may be based on assessment of present mental condition, which is based upon a consideration of past behavior of the person within six years prior to the time the person attempted, inflicted, or threatened physical harm upon another, and other relevant evidence.