Dicho, FYI here are some sites that might help clarify the issues.

This is a US Fish & Wildlife ivory FAQ site, explaining US law:

http://www.r7.fws.gov/mmm/faq.html

The international laws governing ivory trade (for the most part) is the Convention on International Trade in Endangered Species (CITES). That site is here:

http://www.cites.org/

CITES Canada site is here:

http://www.cites.ec.gc.ca/cites/html/eng/sct0/index_e.htm

And a Canadian Inuit site with one Inuit perspective on CITES and the US'Marine Mammal Protection Act:

http://www.tapirisat.ca/page2html/OTHERhtml/Acts/acts.html