If the levy of a tax has been approved under section 28E.22, a public safety commission shall be established under section 28E.6. The public safety commission shall be responsible for administering the unified law enforcement agreement. The public safety commission shall be composed of elected officials from public agencies party to the agreement. The composition of the commission shall be determined by the terms of the agreement. A vacancy shall exist when a member of the commission ceases to hold the elected office which qualifies the member for commission membership.