Well it works the other way also. Most Canadians can tell you they had the same experiences with US entry and many of them where before 9/11. I once had US customs go through my car ashtray with tweezers saying over and over "If I find a seed, the car is mine". That was only the start of it. Generally US customs officials have been much more rude in there behavior but the Canadian officials since 9/11 are catching up mostly because of US government pressure to crack down. After all everyone knows those 9/11 terrorists came through Canada.