N.J. Stat. § 43:13-22.24
Once each year the commission may require any member retired for disability, who is under the age of 60 years to undergo medical examination by a physician or physicians designated by the commission. The examination may be made at the residence of the pensioner or other place mutually agreed upon. If the physician or physicians thereupon report and certify to the commission that the pensioner is not permanently and totally incapacitated, either physically or mentally, for the performance of the duties which were performed by the pensioner before retirement on disability, then the commission shall order said pensioner to be taken from the pension rolls and restored to the position held by said pensioner before his or her retirement.
N.J.S. § 43:13-22.24