R.I. Gen. Laws § 45-21.2-17: Woonsocket police department.

All persons appointed police officers to the Woonsocket police department, after July 1, 1980, are a group under this retirement system. Upon the effective date of participation of the city of Woonsocket in this retirement system any police officer appointed after July 1, 1980, waives and renounces all accrued rights and benefits of any other pension or retirement system supported wholly or in part by a participating municipality, becomes a member of this retirement system, and is not be required to make a contribution under any other pension or retirement system of a participating municipality, anything to the contrary notwithstanding.