The commissioner at the time of his appointment and qualification shall be a citizen of the United States and a resident of the state of West Virginia, shall have been a qualified voter in the state for a period of at least one year next preceding his appointment, and shall be not less than thirty years of age. No commissioner during his period of service as such shall hold any other office under the laws of this state or of the United States.
W. Va. Code § 17A-2-3