In re Melvin S.

Although the period of retention directed by the order appealed from has expired, under the circumstances, the matter qualifies as an exception to the mootness doctrine, in that, inter alia, the issue presented is likely to recur and may in the future evade review (see Matter of Harry M., 96 AD2d 201, 202 [1983]).

It was incumbent upon the petitioner to prove, by clear and convincing evidence, that the patient at issue was mentally ill, in need of further treatment, and posed a substantial threat of physical harm to himself or others, such that his retention is warranted (see Matter of John…