California Code, Food and Agricultural Code (Formerly Agricultural Code) - FAC § 31102

(a) The dog is found in the act of killing, wounding, or persistently pursuing or worrying livestock or poultry on land or premises which are not owned or possessed by the owner of the dog.

(b) The person has such proof as conclusively shows that the dog has been recently engaged in killing or wounding livestock or poultry on land or premises which are not owned or possessed by the dog's owner.

No action, civil or criminal, shall be maintained for the killing of any such dog.