49 CFR § 385.308 - What may cause an expedited action?
(a) A new entrant that commits any of the following actions, identified through roadside inspections or by any other means, may be subjected to an expedited safety audit or a compliance review or may be required to submit a written response demonstrating corrective action:
(1) Using a driver not possessing a valid commercial driver's license to operate a commercial motor vehicle as defined under § 383.5 of this chapter. An invalid commercial driver's license includes one that is falsified, revoked, expired, or missing a required endorsement.
(i) A highway route controlled quantity of certain radioactive materials (Class 7).
(ii) Any quantity of certain explosives (Class 1, Division 1.1, 1.2, or 1.3).
(iii) Any quantity of certain poison inhalation hazard materials (Zone A or B).
(4) Being involved in, through action or omission, two or more hazardous materials reportable incidents as described under 49 CFR 171.15 or 171.16, involving hazardous materials other than those listed above.
(5) Using a driver who tests positive for controlled substances or alcohol or who refuses to submit to required controlled substances or alcohol tests.
(7) Having a driver or vehicle out-of-service rate of 50 percent or more based upon at least three inspections occurring within a consecutive 90-day period.
(c) FMCSA may schedule a compliance review of a new entrant that commits any of the actions listed in paragraph (a) of this section at any time if it determines the violation warrants a thorough review of the new entrant's operation.
(d) Failure to respond within 30 days of the notice to an Agency demand for a written response demonstrating corrective action will result in the revocation of the new entrant's registration.