As used in this chapter, “agent” means the agent or employee of the owner of the damaged or destroyed property, any county or city predator control officer, any employee of the Animal Damage Control Section of the United States Department of Agriculture, any departmental personnel, or any authorized or permitted houndsman registered with the department as possessing the requisite experience and having no prior conviction of any provision of this code or regulation adopted pursuant to this code. A plea of nolo contendere is a conviction for purposes of this section.