I drove from Detroit to Toronto via Windsor, and was subjected to a vehicle search and questioning. I pulled up my hotel reservation at the agents' request, and he snatched my phone out of my hands and started going through my emails. He couldn't wrap his head around why anyone would want to take a roadtrip to toronto for an extended weekend, other than to run drugs. I've also been interrogated when flying into Canada for work. Canadian border security is notorious for this kind of stuff.