It is a common practice for outside litigation counsel to represent current, and even former, employees of corporate clients during depositions. This practice, however, is governed by ethical rules (and opinions and case law) that must be considered in advance.
There are two major exceptions to the lawyer-client privilege under the California Evidence Code, as discussed below. 2.1. Crime or fraud. 2.2. Preventing death or substantial physical harm.
The United States Supreme Court rejected the control group test in Upjohn v. United States, 449 U.S. 383 (1981). Most courts now apply the Supreme Court's reasoning in that case to corporate privilege claims, including those involving former employees.
Amended Rule 4.2(a) provides: “In representing a client, a lawyer shall not communicate about the subject of the representation with a person who the law- yer knows is represented in the matter by another lawyer unless the lawyer has the consent of the other lawyer or is authorized by law or court order to do so.” ...
The privilege extends only to communications that the client intends to be confidential. Communications made in non-private settings, or in the presence of third persons unnecessary to accomplish the purpose for which the attorney was consulted, are not confidential and therefore are not protected by the privilege.
The attorney-client privilege applies to communications “to whom disclosure is reasonably necessary for the transmission of the information or the accomplishment of the purpose for which the lawyer is consulted.” Cal. Evid. Code § 952. This includes communications to an expert consultant.
Crime or Fraud Exception. If a client seeks advice from an attorney to assist with the furtherance of a crime or fraud or the post-commission concealment of the crime or fraud, then the communication is not privileged.