Cal. Pub. Util. Code § 5387
(c)
(1) A charter-party carrier shall have its authority to operate as a charter-party carrier permanently revoked by the commission or be permanently barred from receiving a permit or certificate from the commission if it commits any of the following acts:
(d) A peace officer, as designated pursuant to Chapter 4.5 (commencing with Section 830) of Title 3 of Part 2 of the Penal Code, may impound a bus or limousine of a charter-party carrier of passengers for 30 days pursuant to Section 14602.9 of the Vehicle Code if the peace officer determines that any of the following violations occurred while the driver was operating the bus or limousine of the charter-party carrier: