California, United States of America
The following excerpt is from Quaglino v. Quaglino, 152 Cal.Rptr. 47, 88 Cal.App.3d 542 (Cal. App. 1979):
Whether or not Rule 4-101 of the Rules of Professional Conduct applies to bar a lawyer's appearance in a case of course depends upon the facts of each case. (DeLong v. Miller, 133 Cal.App.2d 175, 178, 283 P.2d 762.) Mere prior professional association with the former client is not enough.
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