N.C. Gen. Stat. § 135-30
The federal-state agreement provided in G.S. 135-21 shall be revised and extended to provide that, effective on, or retroactively as of, such date as may be fixed by the Board of Commissioners of the Law-Enforcement Officers' Benefit and Retirement Fund, all or some of the members of said fund who are employees of the State of North Carolina or any of its agencies, shall be covered by the Social Security Act, dependent upon a referendum or referendums held pursuant to federal laws and regulations, at the request of said board, with the approval of the Governor: Provided, that such action shall be subject to the conditions and terms set forth in such agreement and subject to all applicable provisions of Article 2 of Chapter 135 of the General Statutes not inconsistent herewith: Provided, however, that the effecting of social security coverage shall not cause to be reduced or lowered the amount of the contributions to be made to the Law-Enforcement Officers' Benefit and Retirement Fund by any State employee who is a member thereof nor the amount to be contributed by the State to said fund with respect to each State employee member; provided, further, from and after the date the above-described employees become subject to the Social Security Act, there shall be deducted from each such employee's salary for each and every payroll period such sum as may be necessary to pay the amount of contributions of taxes required on his account with respect to social security coverage, and the State, or the appropriate State agency, as an employer, shall pay the amount of contributions or taxes with respect to such person, as may be necessary on his account to effect the above-described social security coverage.
N.C. Gen. Stat. § 135-30