Jim J Solo wrote on Jun 3^rd, 2015 at 4:55pm:

Hmm? Is it my bad if I leave my Passport in my car while in Q if I crossed at Ft Frances?

If you mean you cross the border at Ft Frances and put in from CA side and plan to exit CA side?  Not a problem as far as I can tell.  However should your plan to exit on CA side change - like a serious medical emergency that requires you to be evaced somewhere - you might wish you had the passport with you.  (That is more the case if you enter on a RABC imho.)  On the other hand, I could see my passport being left at some site while I with a stroke or heart attack or some such malady am whisked away by air to Atikokan (or Thunder Bay?) for medical attention, and then its really hard to get.  It's one of those cases where I wish I had a redundant WHTI document or two.