Tennessee Code Title 68. Health, Safety and Environmental Protection § 68-221-911

(a) The board may revoke the certificate of an operator when it is found that the operator has practiced fraud or deception; that reasonable care, judgment or the application of such operator's knowledge was not used in performance of such operator's duties; or that the operator is incompetent to properly perform such operator's duties.

(b) When the commissioner believes an operator has engaged in any of the activities set forth in subsection (a), the commissioner may issue an order suspending the operator's certificate until the board conducts a hearing on the revocation of the operator's certificate for such activities. When the commissioner has issued a suspension order, the board shall conduct its revocation hearing and render its decision within ninety (90) days of the operator's suspension. In the event the board does not render its decision within ninety (90) days of the operator's suspension, the suspension order shall expire and no longer be in force or effect. However, the commissioner may reissue an order of suspension for a period not to exceed ninety (90) days.

(c) When the board determines an operator's certificate should be revoked under subsection (a), the board shall establish the timing, terms and conditions for any reinstatement of the operator's certificate.