N.Y. Crim. Proc. Law § 100.20

§ 100.20 Supporting deposition; definition, form and content.\n A supporting deposition is a written instrument accompanying or filed\nin connection with an information, a simplified information, a\nmisdemeanor complaint or a felony complaint, subscribed and verified by\na person other than the complainant of such accusatory instrument, and\ncontaining factual allegations of an evidentiary character, based either\nupon personal knowledge or upon information and belief, which supplement\nthose of the accusatory instrument and support or tend to support the\ncharge or charges contained therein.\n