(a) For the purposes of this section “detective” means any detective, chief inspector or inspector in the Division of Criminal Justice or chief detective.

(b) (1) Each detective who is forty-seven years of age or over and who has completed twenty years of service shall, at the time he retires or is retired in accordance with the provisions of this chapter, receive a retirement salary equal to fifty per cent of his base salary for twenty years of service as a detective, or combined service as a state policeman and a detective, and for each additional full month of service as a detective after twenty years of such service there shall be added to his retirement salary a sum equaling one-twelfth of two per cent, computed on his base salary. (2) Any detective who previously served as a state police officer and who transferred directly from the state police force to a position as a county detective or detective or chief inspector or inspector within the Division of Criminal Justice shall receive the same retirement benefits under this chapter as he would have received if he had remained a member of the state police force. (3) Retirement benefits payable under this section shall not be reduced at any time on account of a member’s eligibility for or receipt of federal Social Security benefits, unless the member has previously received a refund of contributions when transferring from part A to part B pursuant to § 5-158h.

(c) A member who has completed twenty years of service as a detective, or combined service as a state policeman and a detective, but who leaves such service on or after October 1, 1982, but prior to reaching his forty-seventh birthday, shall, upon his own application, be entitled to the benefits provided in subsection (b) of this section at any time after reaching his forty-seventh birthday.

(d) Notwithstanding the provisions of subsection (b) of this section, on and after October 1, 1982, a member who has completed twenty years of service as a detective or combined service as a policeman and a detective and is thus eligible for benefits under this section shall have any other Connecticut state employment recognized in calculating the amount of his benefit.

(e) Service of a member as a sworn member of an organized police department of a municipality within this state may be counted as service as a detective for the purposes of this section if the member makes retirement contributions to the State Employees Retirement Fund of either two or five per cent, as appropriate, of his municipal salary for the period of such municipal service, plus an amount determined by the Retirement Commission as necessary to fund the increased benefits payable by reason of such purchase with interest at the rate of six and one-half per cent, compounded annually, on such payment. No credit shall be granted under this subsection for any period of service for which a retirement benefit is being paid by any governmental unit or where such grant would result in multiple service credit for the same period of service. Service credit for retirement purposes shall not be granted unless payment of contributions and interest is completed.