1. Upon the application of the chief of police or a member, any member who has completed ten or more years of creditable service or upon the police retirement system created by sections 86.200 to 86.366 first attaining, after August 28, 2013, a funded ratio, as defined in section 105.660 and as determined by the system’s annual actuarial valuation, of at least eighty percent, a member who has completed five or more years of creditable service and who has become permanently unable to perform the duties of a police officer as the result of an injury or illness not exclusively caused or induced by the actual performance of his or her official duties or by his or her own negligence shall be retired by the board of trustees of the police retirement system upon certification by the medical board of the police retirement system and approval by the board of trustees of the police retirement system that the member is mentally or physically unable to perform the duties of a police officer, that the inability is permanent or likely to become permanent, and that the member should be retired.

2. Once each year during the first five years following such member’s retirement, and at least once in every three-year period thereafter, the board of trustees may, and upon the member’s application shall, require any nonduty disability beneficiary who has not yet attained sixty years of age to undergo a medical examination at a place designated by the medical board or such physicians as the medical board appoints. If any nonduty disability beneficiary who has not attained sixty years of age refuses to submit to a medical examination, his or her nonduty 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 board of trustees.

3. If the medical board certifies to the board of trustees that a nonduty disability beneficiary is able to perform the duties of a police officer, and if the board of trustees concurs on the report, then such beneficiary’s nonduty disability pension shall cease.

4. If upon cessation of a disability pension under subsection 3 of this section, the former disability beneficiary is restored to active service, he or she shall again become a member, and he or she shall contribute thereafter at the same rate as other members. Upon his or her subsequent retirement, he or she shall be credited with all of his or her active retirement, but not including any time during which the former disability beneficiary received a disability pension under this section.