Such approvals may be granted for periods not exceeding two years each, provided that such person may not return to work in the same or similar position for a period of one year following retirement. The authority or officer specified in paragraph (a) of this subdivision, upon approving employment of a retired person under this section, shall certify such approval to the retirement system or pension plan from which such person is receiving a retirement allowance.
N.Y. Retire. and Soc. Sec. Law § 211