2 Del. Admin. Code § 2287-7.0
OPC may investigate and inquire into the operation of a public carrier whether certified or not in accord with this Act. The OPC may compel a public carrier to produce documents, vehicles, owners and drivers as part of its investigation or inquiry. Any written received by a public carrier from the OPC shall require a response within 7 days of its receipt. A party's failure or refusal to comply with a request from the OPC may result in the imposition of fines and penalties including, but not limited to, a suspension or revocation of the public carrier's Certificate of Public Convenience and Necessity or a rejection of an application for a Certificate of Public Convenience and Necessity. The OPC may seek a subpoena from the Delaware Superior Court to compel the production of documents, vehicles or individuals when the public carrier fails or refuses to comply with a written request and the imposition of penalties.
2 Del. Admin. Code § 2287-7.0