N.Y. Comp. Codes R. & Regs. tit. 9, § 6056.4
(a) Each employer shall, in the form set forth in section 6056.5 of this Part, with respect to each police or peace officer employed by it, submit or cause to be submitted the following:
(7) date of appointment or employment.
Employers shall inform police or peace officer employees that disclosure of an employee's social security number is for identification purposes only and is voluntary on the employee's part. A post-office box number shall not be accepted as an employee’s permanent residence or domicile.
(b) The commissioner may require any employer to report the following additional information in such form as he may prescribe:
(d) Each employer shall, in the manner set forth in section 6056.5(c) of this Part, with respect to each police or peace officer employed by it, immediately notify the division the effective date such officer ceases to serve and the reason for such, which shall include one of the following: