No certificate of qualification shall be
transferred, lent or used for any purpose whatsoever except by the person to whom such
certificate has been issued. It shall be the duty of each certified person to have such
certificate in their possession whenever performing any electrical, plumbing, or
building-related mechanical work in the county and to permit an inspector to examine such
certificate upon request. It shall also be the duty of the certified person to report
promptly the loss of such certificate and to apply for a duplicate to the Virginia Board
for Contractors.