Can a U.S. RN with BSN work in Canada?

Yes, after passing the Canadian RN Exam (CRNE) and getting their license in the province in which they plan to work and securing a job offer and getting permission to work from immigration (thanks to NAFTA). Some provinces require the BSN, some do not.

http://allnurses.com/forums/f108/wha...da-169763.html
http://allnurses.com/forums/f108/con...ly-171545.html
http://allnurses.com/forums/f108/how...da-167074.html
http://allnurses.com/forums/f108/exp...io-169189.html
http://allnurses.com/forums/f108/mov...es-166320.html
http://allnurses.com/forums/f108/can...da-167901.html
http://allnurses.com/forums/f108/can...dn-164458.html

The above threads all deal with your question. They are all from the first three pages of this forum. If you use the search feature I'm sure you'll find even more.