California Code, Food and Agricultural Code (Formerly Agricultural Code) - FAC § 6303

(a) It is unlawful for any person, except under written permission from a plant quarantine officer or under his specific direction, to move any lot or shipment of plants or other things to which a warning tag or notice has been affixed pursuant to this division, or to remove, alter, destroy, deface, or mutilate any such warning tag or notice.

(b) If any shipment of plants or things is allowed to transit the state or transit to a given destination county under a quarantine warning-hold notice, the shipment of plants or things shall not be diverted to another destination without the written permission of the director or the commissioner of the destination county.

(c) Diversion of a shipment as described in subdivision (b) is unlawful.

(d) If a shipment of plants or things requires a state or county plant quarantine officer to be present at the destination to supervise the unloading, inspection, or treatment of a quarantine shipment, the director or commissioner, as the case may be, may charge the shipper or receiver a service fee for the cost of the services. Service fees shall be determined based on the director or commissioner's costs for the services rendered.