(1) That the person is mentally ill or suffering from substance abuse;

(2) That the person is imminently dangerous to self or others, is gravely disabled or is obviously ill; and

(3) That the person is in need of care or treatment, or both, and there is no suitable alternative available through existing facilities and programs which would be less restrictive than hospitalization. [L 1984, c 188, pt of §3; am L 1985, c 75, §2; am L 1986, c 335, §4]