It's absolutely amazing to me how you cannot discern the difference between a Law Enforcement Officer who operates under the Supreme Court's ruling requiring RAS to allow them to search a vehicle without a warrant - and yes, a trained sniffer dog alerting on the outside of your car gives them RAS - and an agricultural worker whose desire to search your vehicle is not under that same umbrella. The agricultural worker may ask to search and you can simply say no and drive off from whence you came. He has no power to search.
In order to put this to bed I give you this:-
What Legal Authority do your inspectors have to stop and check my vehicle?
The Department’s legal authority for conducting vehicle and commodity inspections lies in the California Food and Agricultural Code, specifically Sections 5341-5353 and 6301-6465. Although submitting to inspection is voluntary, vehicle and commodities are not allowed to enter until released by an inspector.
Highlighting added by me to make sure you don't skip over it...
https://www.cdfa.ca.gov/plant/pe/ExteriorExclusion/borders_faq.htmlSo, the California Department of Food and Agriculture's own web site, (you know, the very people who run the inspection stations), is telling you you are wrong but somehow I get the feeling that won't sway you either...