The Board of Trustees shall require each employee upon enrolling in the Retirement System to provide information on the membership application concerning any mental or physical incapacities existing at the time the member enrolls.
Notwithstanding the foregoing to the contrary, any beneficiary who commenced retirement with an early or service retirement benefit has the right, within three years of this retirement, to convert to an allowance with disability retirement benefits without modification of any election of optional allowance previously made; provided, the beneficiary presents clear and convincing evidence that the beneficiary would have met all applicable requirements for disability retirement benefits while still in service as a member. The allowance on account of disability retirement benefits to the beneficiary shall be retroactive to the effective date of early or service retirement.
N.C. Gen. Stat. § 135-59