N.Y. Comp. Codes R. & Regs. tit. 20, § 2371.5
(a) A data subject requesting access to his or her own record may be required to provide proof of his or her identity.
(2) When a request for access is made by mail, there may be required verification of a signature or inclusion of an identifier generally known only by a data subject, or similar appropriate identification.
(c)
(b)