We're on the internet, if this is such a simple thing to certify by asking a lawyer or a game warden then it should be reasonably easy to provide an authoritative link.
The closest I can find is this https://www.findlaw.com/legalblogs/california-case-law/scotu...
To Quote: "The California Supreme Court ruled that a game warden who reasonably believes that a person has recently been fishing or hunting, but lacks reasonable suspicion that the person has violated an applicable fish or game statute or regulation, may stop the suspect's vehicle to demand the person display all fish or game the person has caught or taken."
This is obviously more power in some ways than a police officer has , but in some ways also very limited. If you can provide something more authoritative, extensive and to the point than that I think you should.