No rollover contribution shall be made under this section, and the Retirement System shall not accept any amount as a rollover contribution, unless the amount required for the payment or repayment is eligible to be rolled over to a qualified trust in accordance with applicable law and the member provides evidence satisfactory to the Retirement System that the amount qualifies for rollover treatment. Unless received by the Retirement System in the form of a direct rollover, the rollover contribution must be paid to the Retirement System on or before the 60th day after the date it was received by the member.
N.C. Gen. Stat. § 120-4.16