What is the test for branch 1 of the section 12 exemption under section 12 of the Criminal Code of Canada?

Branch 1 of the section 12 exemption encompasses two heads of privilege, as derived from the common law: (i) solicitor-client communication privilege; and (ii) litigation privilege. In order for branch 1 of section 12 to apply, the institution must establish that one or the other, or both, of these heads of privilege apply to the records at issue. [Order PO-2538-R; Blank v. Canada (Minister of Justice) (2006), 2006 SCC 39 (CanLII), 270 D.L.R. (4th) 257 (S.C.C.) (also reported at [2006] S.C.J. No. 39)].

Solicitor-client communication privilege protects direct communications of a confidential nature between a solicitor and client, or their agents or employees, made for the purpose of obtaining or giving professional legal advice [Descôteaux v. Mierzwinski (1982), 1982 CanLII 22 (SCC), 141 D.L.R. (3d) 590 (S.C.C.)].