In order to fly an LSA-certificated aircraft into Canada, you need to have specific written permission from Transport Canada. LSA airworthiness certificates are not valid outside the U.S. without specific permission. The Canadian officials will not allow a pilot to cross the international border without an FAA medical certificate. They would have to issue written permission for the pilot to operate in Canadian airspace, but they have not yet done so. There is no exemption available. You'll be glad to know, however, that EAA, in partnership with Transport Canada, the FAA and the Bahamas, is working to resolve this issue between these three countries.