Rule 502. Identity of informer.
(a) Rule of privilege. The United States or a state or subdivision thereof has a privilege to refuse to disclose the identity of a person who has furnished information relating to or assisting in an investigation of a possible violation of a law.
(b) Who may claim the privilege. The privilege may be claimed by an appropriate representative of the public entity to which the information was furnished.
(c) Exceptions and limitations.
(1) Voluntary disclosure; informer a witness. No privilege exists under this rule if the identity of the informer or the informer's interest in the subject matter of the informer's communication has been disclosed to those who would have cause to resent the communication by a holder of the privilege or by the informer's own action, or if the informer appears as a witness for the public entity.
(2) Testimony on relevant issue. If it appears in the case that an informer may be able to give testimony relevant to any issue in a criminal case or to a fair determination of a material issue on the merits in a civil case to which a public entity is a party, and the public entity invokes the privilege, the court shall give the public entity an opportunity to show facts relevant to determining whether the informer can, in fact, supply that testimony.
If the Court finds that the informer should be required to give the testimony, and the public entity elects not to disclose the informer's identity, the court on motion of the defendant in a criminal case shall dismiss the charges to which the testimony would relate, and the court may do so on its own motion. In civil cases, the court may make any order that justice requires.