The last time I went through YVR domestic security it was around 6pm on a Saturday. I recall the nexus and priority line being the same thing. I was told by the agent that I could not access the priority lane without pulling out my nexus card; priority was "closed" so my S100K boarding pass meant nothing.
Whisky tango foxtrot!
So I got out my nexus card but I did not get it! Poor training?