N.J. Stat. § 43:15A-104
The percentage contribution rate of each member who is a law enforcement officer shall be fixed according to his age at the time of becoming a permanent and full-time employee of the State and shall be 1/2 of the total percentage contribution rate calculated for such age by the actuary of the board of trustees to be required to provide all benefits of service retirement, ordinary disability retirement, and termination of service benefits provided by this act and the act to which this act is a supplement. In the event that a member ceases to hold a position as a law enforcement officer although continuing his employment in a position covered by the Public Employees' Retirement System, his rate of contribution shall be fixed in accordance with the rates applicable at that time to persons becoming members who are not law enforcement officers, except that his age at the time of becoming a permanent full-time employee of the State shall be used in determining his rate of contribution. Members of the retirement system shall contribute 6.5% of compensation to the system on and after the effective date of P.L. 2011, c. 78, with an additional contribution of 1% to be phased-in in equal increments over a period of seven years commencing with the first year following that effective date.
N.J.S. § 43:15A-104