To take first the obvious. The interception of private communications constitutes a search or seizure, thus is subject to the requirement of reasonableness imposed by s. 8 of the Charter: R. v. Duarte,  1 S.C.R. 30. A search or seizure is reasonable if it is authorized by a law that is itself reasonable and is carried out in a reasonable manner: R. v. Collins,  1 S.C.R. 265, at p. 278.
 Second, to be carried out in a reasonable manner pursuant to a conventional authorization issued under s. 186(1) of the Criminal Code, the interception of private communications must be carried out in accordance withthe terms of a valid authorization, as required by s. 184(2)(b).
 Third, s. 186(4) of the Criminal Code prescribes the content and limitations of a conventional authorization. Among other things, the authorization must generally describe the place of interception, if a general description of that place can be given, and generally describe the manner of interception: Criminal Code, s .186(4)(c).
 Fourth, the authorizing judge has a discretion, but not an obligation, to include terms and conditions in the authorization. This discretion, for which s. 186(4)(d) provides, becomes engaged if and to the extent that the authorizing judge considers that terms and conditions are advisable in the public interest.
 Fifth, among the terms and conditions a judge may include in an authorization as advisable in the public interest are terms and conditions the purpose of which is to curtail the interception of the private communications in which designated targets do not participate, but rather are made by innocent third parties. These terms and conditions are often described as minimization clauses. Unlike §2518(5) of its American equivalent, Title III of the Omnibus Crime Control and Safe Streets Act of 1968, 18 U.S.C.A. §§2510-2520, Part VI of the Criminal Code and, in particular, s. 186(4), does not make minimization a mandatory term of every authorization:R. v. Finlay (1985), 52 O.R. (2d) 632 (C.A.), at pp. 658-660; Thompson, at pp. 1130-1132, and 1137-1138.