S.C. Code Regs. § 24-29
At least three of the five local review board members shall be present before a case may be reviewed. If only two board members are present, however, a review may proceed if all attending parties agree to proceed. Each local review board member may belong to only one local review board. In the event of a vacancy on a local review board due to an unfilled appointment, a member from another local review board may be invited to serve until the vacancy is filled. If a local review board member is absent from one-third or more of the local review board meetings involving case reviews during a year, and if the State Board of Directors or another interested party so reports to the Governor's Office, the Governor may remove the person from office and may appoint someone else to the local board.
S.C. Code Regs. 24-29