California Code, Business and Professions Code - BPC § 4166

(a) A wholesaler that uses the services of a third-party logistics provider or carrier, including, but not limited to, the United States Postal Service or a common carrier, shall be liable for the security and integrity of any dangerous drugs or dangerous devices through that provider or carrier until the drugs or devices are delivered to the transferee at its board-licensed premises.

(b) A third-party logistics provider that uses the services of a carrier, including, but not limited to, the United States Postal Service or a common carrier, shall have in place and comply with written policies and procedures that provide for both of the following:

(c) Nothing in this section is intended to affect the liability of a wholesaler, third-party logistics provider, or other distributor for dangerous drugs or dangerous devices after their delivery to the transferee.