That the prosecuting witness in any criminal action or proceeding may, at his own expense, employ an attorney or attorneys to assist the county attorney to perform his duties in any criminal action or proceeding under any of the laws of the state of Kansas, and such attorney or attorneys shall be recognized by the county attorney and court as associate counsel in such action or proceeding, and no prosecution shall be dismissed over the objection of such associate counsel until the reason of the county attorney for such dismissal, together with the objections thereto of such associate counsel, shall have been filed in writing, argued by counsel, and fully considered by the court.