Each Program participant shall be issued a unique identification card with a unique identification number. The unique identification number may not be cross–indexed to any personal identifying data on the participant. Any information obtained by a Program that identifies Program participants, including Program records, is: Confidential; Not open to public inspection or disclosure; and Not discoverable in any criminal or civil proceeding. Notwithstanding the provisions of subsection (b) of this section, on the written consent of a Program participant, information obtained by a Program that identifies the Program participant may be released or disclosed to an individual or agency for purposes of linking to services under § 24–903(a)(6) of this subtitle. In addition to the provisions of paragraph (1) of this subsection, if a Program participant raises the issue of participation in a Program either as a subject matter or legal defense in an administrative, civil, or criminal proceeding, the Program participant waives the confidentiality as to identity provided under subsection (b) of this section. Substance–related treatment records requested or provided under this section are subject to any additional limitations on disclosure or re–disclosure of a medical record developed in connection with the provision of substance–related treatment services under State law or 42 U.S.C. § 290dd–2 and 42 C.F.R. Part 2.