(a) Any person who has retired from the service of the state under any provision of this chapter and who is reemployed on a permanent basis may elect, upon completion of not less than six months of continuous service of reemployment or other state service, to make contributions to the retirement fund and resume membership in the retirement system. He may also elect to obtain credit for service for the period between the date of such reemployment or other state service and the date of such election, provided he shall contribute to the retirement fund for each month of such service a sum equal to the total contributions he would have paid if he had been a member of the retirement system during such period. Such payment shall be made within six months of the date on which his contributions to the retirement fund are resumed.

(b) Any person who has retired from the service of the state under any provision of this chapter and who is elected to serve in the General Assembly may elect, effective from the first day of his term of office, to make contributions to the retirement fund and resume membership in the retirement system.

(c) No member reemployed under this section or under § 5-164 or elected to serve in the General Assembly or otherwise reentering state service shall receive a retirement income during such member’s reemployment or other state service except (1) if such member’s services as an employee are rendered for not more than one hundred twenty working days in any one calendar year, provided that any member reemployed for a period of more than one hundred twenty working days in one calendar year shall reimburse the state retirement fund for retirement income payments received during such one hundred twenty working days; (2) if such member’s services are as a member of the General Assembly or as a sessional employee of the General Assembly during the regular legislative session, such member’s retirement income payments shall not be suspended; or (3) if such member’s preretirement services which counted towards retirement are other than as a special deputy sheriff pursuant to chapter 78, and if such member’s postretirement services are as a special deputy sheriff or, on and after December 1, 2000, as a judicial marshal and such member was employed as a special deputy sheriff on July 1, 1999.

(d) Upon the subsequent retirement of a member who has made an election under subsection (a) of this section, or upon the expiration of the term of office of a member of the General Assembly who has made an election under subsection (b) of this section, his retirement income shall be recomputed on the basis of his total period of credited state service, excluding any period for which a retirement salary was paid under subdivision (1) or (2) of subsection (c) of this section, and with his base salary recomputed on the basis of his three highest-paid years of his total state service.