Canadians have unique procedural options to apply for admission in a status that authorizes employment. The different procedural options primarily are for L‐1 intracompany transferees and TN professional workers.
Intracompany Transferees L1 Visa:
Under the North American Free Trade Agreement (NAFTA), citizens of Canada are authorized to present a petition for L‐1 classification concurrently with an application for admission to the United States. Customs and Border Protection (CBP) officers are authorized to adjudicate such L petitions.
Visa Lawyer Blog

