1. Any member in active service who is permanently unable to perform the full and unrestricted duties of a police officer as the natural, proximate, and exclusive result of an accident occurring within the actual performance of duty at some definite time and place or through an occupational disease arising exclusively out of and in the course of his or her employment shall be retired by the board of police commissioners upon certification by one or more physicians of the medical board that the member is mentally or physically unable to perform the full and unrestricted duties of a police officer, that the inability is permanent or likely to become permanent, and that the member should be retired. The inability to perform the full and unrestricted duties of a police officer means that the member is unable to perform all the essential job functions for the position of police officer as established by the board of police commissioners.

2. (1) Upon such retirement on or after August 28, 2001, and prior to August 28, 2013, a member shall receive a base pension equal to seventy-five percent of his or her final compensation for so long as the permanent disability shall continue, during which time such member shall for purposes of this section be referred to as a disability beneficiary. Such pension may be subject to offset or reduction under section 86.1190 by amounts paid or payable under any workers’ compensation law;

(2) Upon such retirement on or after August 28, 2013, a member shall receive a base pension equal to eighty percent of his or her final compensation for so long as the permanent disability shall continue, during which time such member shall for purposes of this section be referred to as a disability beneficiary. Such pension may be subject to offset or reduction under section 86.1190 by amounts paid or payable under any workers’ compensation law.

3. Once each year during the first five years following his or her retirement, and at least once in every three-year period thereafter, the retirement board may, and upon the member’s application shall, require any disability beneficiary who has not yet attained the age of sixty years to undergo a medical examination at a place designated by the medical board or some member thereof. If any disability beneficiary who has not attained the age of sixty years refuses to submit to a medical examination his or her disability pension may be discontinued until his or her withdrawal of such refusal, and if his or her refusal continues for one year, all rights in and to such pension may be revoked by the retirement board.

4. If one or more members of the medical board certify to the retirement board that a disability beneficiary is able to perform the full and unrestricted duties of a police officer, and if the retirement board concurs on the report, then such beneficiary’s disability pension shall cease.

5. If upon cessation of a disability pension under subsection 4 of this section, the former disability beneficiary is restored to active service, such member shall contribute to this retirement system thereafter at the same rate as other members. Upon subsequent retirement, such member shall be credited with all his or her creditable service, including any years in which such member received a disability pension under this section.

6. If upon cessation of a disability pension under subsection 4 of this section, the former disability beneficiary is not restored to active service, such member shall be entitled to the retirement benefit to which such member would have been entitled if such member had terminated service at the time of such cessation of the disability pension. For the purpose of such retirement benefits, such former disability beneficiary will be credited with all his or her creditable service, including any years in which such member received a disability pension under this section.