Tenn. Code Ann. § 55-50-403: Employer responsibilities

No employer shall knowingly allow, permit, or authorize an employee to operate a commercial motor vehicle in the United States during any period:

(1) In which the employee has a driver license suspended, revoked, or cancelled by a state, has lost the privilege to operate a commercial motor vehicle in a state, or has been disqualified from operating a commercial motor vehicle;

(2) In which the employee has more than one (1) driver license. Each employer shall require the information specified in § 55-50-402(c) to be provided by the applicant;

(3) In which the driver, or the CMV the employee is driving, or the motor carrier operation, is subject to an out-of-service order; or

(4) In violation of a federal, state or local law or regulation pertaining to railroad-highway grade crossings.