1. An employer shall not allow, require, permit or authorize a person to operate a commercial motor vehicle if the employer knows or should reasonably know that the operation of the motor vehicle is:
(a) During a period in which the person does not have a current commercial driver’s license or commercial learner’s permit or does not have a commercial driver’s license or commercial learner’s permit with the proper class or endorsements;
(b) In violation of any restriction on the commercial driver’s license or commercial learner’s permit of the person;
(c) During a period in which the person has a commercial driver’s license or commercial learner’s permit disqualified by a state, has lost the right to operate a commercial motor vehicle in a state or has been disqualified from operating a commercial motor vehicle;
(d) During a period in which the person has more than one commercial driver’s license or commercial learner’s permit;
(e) During a period in which the person, the motor vehicle he or she is operating or the motor carrier operation is subject to an out-of-service order, as defined by 49 C.F.R. § 383.5; or
(f) In violation of a federal, state or local law or regulation pertaining to railroad-highway grade crossings.
2. As used in this section, “employer” means any person who owns or leases a commercial motor vehicle or assigns an employee to operate a commercial motor vehicle.