Caution:  I think children 18 and over require their own RABC.

Since the post 9/11 security increases, I'm not sure the routine checks are very frequent at all.  I was led to believe that the Canadian checks at PP were somewhat in retaliation for the increased US immigration scrutiny of Canadians entering - like the many who do every day for work.  But still get one.

I've mused that if, for instance, I left home without mine, would I go or cancel?  Haven't had to face that yet. Thank heavens for fax machines and outfitters.