N.Y. Penal Law § 255.00

§ 255.00 Unlawfully solemnizing a marriage.\n A person is guilty of unlawfully solemnizing a marriage when:\n 1. Knowing that he is not authorized by the laws of this state to do\nso, he performs a marriage ceremony or presumes to solemnize a marriage;\nor\n 2. Being authorized by the laws of this state to perform marriage\nceremonies and to solemnize marriages, he performs a marriage ceremony\nor solemnizes a marriage knowing that a legal impediment to such\nmarriage exists.\n Unlawfully solemnizing a marriage is a class A misdemeanor.\n