Sec. 5.01. CREDITABLE SERVICE. (a) The board shall determine by appropriate rules and regulations, subject to the provisions of this Act, in case of a member's absence, illness, or other temporary separation from service, the portion of each calendar year to be allowed as creditable service.

(b) No credit shall be allowed as service for any period exceeding one month during which a member was absent continuously without pay, except as provided in Subsection (f) of Section 4.01 of this Act, with respect to uniformed service leave of absence; as provided in Section 5.02 of this Act, with respect to military service performed prior to system membership; or as provided in Section 5.03 of this Act, with respect to probationary service in excess of six months.

(c) The board shall verify the records for service claims filed by the members of the police retirement system, in accordance with such administrative rules and regulations as the board may from time to time adopt.