§ 4512. Competency of interested witness or spouse. Except as otherwise expressly prescribed, a person shall not be excluded or excused from being a witness, by reason of his interest in the event or because he is a party or the spouse of a party.
Competency of interested witness or spouse
N.Y. Civil Practice Law & Rules Law § 4512, under Evidence.
N.Y. Civil Practice Law & Rules Law § 4512