Cases often turn on the scope of an exception. Recently the Massachusetts Supreme Judicial Court clarified the "sharply limited" scope of the derivative attorney-client privilege, an exception to the basic rule that disclosure of otherwise privileged communications waives the client's right to prevent disclosure of those communications to third parties, whether in litigation or otherwise - even if that disclosure proves fatal to the client's case. See DaRosa v. City of New Bedford, 471 Mass. 446, 463 (2015). The SJC recognized that exception in a 2009 decision, holding that a third party's involvement in otherwise privileged communications would not waive that privilege where "the [third party's] presence is 'necessary' for the 'effective consultation' between client and attorney" such as where the third party's "role is to clarify or facilitate communications between attorney and client." Comm'r of Rev. v. Comcast Corp., 453 Mass. 293, 307-08 (2009).