I cannot speak for BC, but here in Québec there is only one way to publish pictures with people on it: have everybody who's recognizable have a signed model release. There is no such thing as artistic or literary justifications.

The only exception to this is when you are doing newsworthy items: if you can demonstrate that your photograph is a witness of something deemed of public interest, then you can skip the model release.

Concretely, it means that street photography as an art form is legally impossible without consent or people seen from the back. It does not mean it's impossible: some time ago I did just that, stopping people on the street and having them sign releases:

http://www.apug.org/gallery1/showima...imageuser=6132
http://www.apug.org/gallery1/showima...imageuser=6132
http://www.apug.org/gallery1/showima...imageuser=6132
http://www.apug.org/gallery1/showima...imageuser=6132