(a) If a beneficiary is restored to service as a teacher, he may elect:

(1) Cessation of his retirement allowance, in which case he shall again become a contributing member of the retirement system and be governed by the retirement provisions of this chapter; or

(2) Not to reinstate his membership in the retirement system, in which case his retirement benefits shall be suspended during the period of time he is restored to service. Upon cessation of such service, his prior retirement allowance shall be resumed.

If the returning beneficiary fails to elect either choice, his status shall be as if he had elected paragraph (1) of this subsection.

(b) Anything in this chapter to the contrary notwithstanding, any prior service certificate on the basis of which a member's creditable service was computed at the time of his retirement shall be restored to full force and effect upon his restoration to service. Upon his subsequent retirement he shall be credited with all his service as a member, including service rendered after restoration to service. If he is restored to service on or after attaining age 50, his retirement benefits upon subsequent retirement shall not exceed the sum of the pension which he was receiving immediately prior to his last restoration to membership and the pension payable in respect to his subsequent service, except as provided in subsection (c) of this Code section, provided that if he has served at least two school years as a contributing member after restoration to service and if he reimburses the retirement system for any retirement benefits received from the retirement system during his retirement, plus regular interest, such person shall receive credit for any prior creditable service; and upon subsequent retirement he shall be credited with all his service as a member, which service shall all be counted in determining his retirement benefits upon subsequent retirement. He shall not be limited to the retirement benefits he was receiving prior to his last restoration to membership in the retirement system.

(c) The retirement benefits payable to a beneficiary who retired prior to July 1, 1961, who was restored to service and who subsequently retired on or after July 1, 1961, shall be determined under the pension provisions in effect at the time of that subsequent retirement, provided that such member completed at least one year of creditable service subsequent to such restoration to service.

(d) Anything in this chapter to the contrary notwithstanding, a beneficiary may elect to return to service on an hourly basis as a classroom aide, provided such service is less than full time, or as a substitute teacher without reinstating his membership in the system. If such election is made, he shall continue to receive his retirement benefits and any postretirement benefit adjustments granted, if any, during such part-time service. Such part-time service shall not constitute creditable service and such beneficiary shall not be entitled to a recomputation of retirement benefits upon a cessation of part-time service. (e)(1) A beneficiary of this retirement system shall be deemed to be restored to service within the meaning of this Code section if such beneficiary is employed by an employer:

(A) In a position previously held by a teacher; or

(B) In a capacity which would normally be held by a teacher, as determined by the board of trustees, whether employed directly or indirectly, for which the compensation is greater than one-half of the beneficiary's average annual compensation used to calculate his or her retirement benefit or the beneficiary's final compensation at the time of his or her retirement, whichever is larger; provided, however, that such amount shall be increased by any annual cost-of-living adjustment reflected in the state teacher salary schedule.

(2) If an employer employs a beneficiary in any manner specified in paragraph (1) of this subsection during the calendar month of the effective date of the beneficiary's retirement, the employer shall reimburse the retirement system for all benefits wrongly paid to the beneficiary.

(3) If an employer employs a beneficiary in any manner specified in paragraph (1) of this subsection any time after the last day of the calendar month of the effective date of the beneficiary's retirement, the employer shall so notify the board of trustees, stating the beneficiary's name, salary, number of hours, whether the beneficiary is employed as a teacher, and such other information as the board of trustees requests, and the employer shall reimburse the retirement system for all benefits wrongly paid to the beneficiary.

(4) It shall be the duty of a beneficiary of this retirement system to notify an employer of his or her status as a beneficiary prior to accepting employment with that employer. If a beneficiary fails to so notify an employer and as a result the employer becomes obligated to this retirement system pursuant to paragraph (2) or (3) of this subsection, the beneficiary shall be liable to the employer for any amount the employer is obligated to pay to this retirement system.

(5) If an employer who is obligated to this retirement system pursuant to paragraph (2) or (3) of this subsection fails to pay the amount due, such amount shall be deducted from any funds payable to the employer by the state, including without limitation the Department of Education and the board of regents, and paid to the board of trustees of this retirement system.