Tony is doing research for his supervising attorney to include in a brief that has to be filed with the court of appeals by 5 P.M. today. He finds a case that is on point and provides the exact support needed for their argument. In his haste to summarize the case and get it into the brief, Tony fails to update the case using Shepard's or KeyCite. As a result, he does not inform the attorney that the case was reversed on appeal and is no longer good law. What ethical rule has Tony violated? What impact might Tony's neglect have on the client's case? On Tony's supervising attorney?