No contingent fee agreement shall be made (a) in respect to the procuring of an acquittal upon or any favorable disposition of a criminal charge, (b) in respect of the procuring of a divorce, annulment of marriage or legal separation or (c) in connection with any proceeding where the method of a determination of attorneys' fees is otherwise expressly provided by statute or administrative regulations. Contingent fee arrangements concerning the collection of commercial accounts and of insurance company subrogation claims made in accordance with usual practices in respect of such cases shall not be regarded as champertous, and shall not be subject to Rules 4 and 5.
Wyo. R. State Bar, Att'y Cond. & Prac. 3