New York Codes, Rules and Regulations
Title 2 - DEPARTMENT OF AUDIT AND CONTROL
Chapter VI - New York State and Local Employees' Retirement System and New York State and Local Police and Fire Retirement System
Part 328 - Allowance Of Service Credit For Authorized Leave Of Absence Without Pay
Section 328.3 - Requests for and approval of leaves pursuant to subparagraphs (d)

Upon a finding by the State Comptroller that the experience gained and/or training undertaken by the employee, while on such leave, will be of eventual benefit to his or her public employer, the Retirement System will approve such leave on a contingent basis. A request for such an approval must be filed with the State Comptroller prior to the commencement of the leave. Approval will not be granted for a leave of more than two years.