by the United States-Mexico-Canada Agreement Implementation Act to reflect the new agreement. United States federal regulations The regulations described in the NAFTA Implementation Act were promulgated on December 30, 1993, in a regulation entitled "Temporary Entry of Business Persons Under the North American Free Trade Agreement (NAFTA)". It amended section 214.6 of the Code of Federal Regulations, title 8, to provide procedures for "Canadian and Mexican citizens seeking temporary entry to engage in business activities at a professional level". The section states that "Pursuant to the NAFTA, an applicant seeking admission under this section shall demonstrate business activity at a professional level in one of the professions set forth in Appendix 1603.D.1 to Annex 1603" and then sets forth the professions agreed upon by the NAFTA member states. In 2022, section 214.6 was updated to reflect the transition from NAFTA to USMCA. Description The visa category "Professionals Under the North American Free Trade Agreement" (NAFTA), also known as a TN (Treaty NAFTA) visa, is available only to citizens of Canada and Mexico, under the terms of the USMCA (previously NAFTA). Prior to that, starting in 1989 and continuing through 1993, qualifying individuals practicing one of the professions identified in the Canada–United States Free Trade Agreement (CUSFTA) were able to obtain TC status for legal work in the United States and Canada, creating a limited amount of freedom of labor movement. In 1994, TN status became effective through the North American Free Trade Agreement (NAFTA), which superseded CUSFTA. Qualifications A person may be eligible for TN status, if: The prospective employee is a citizen of Canada or Mexico; The profession is one cited under the USMCA agreement; The company seeking to pursue TN status with the prospective employee meets qualifications cited under the USMCA treaty; The prospective employee has been issued a formal, written full-time or part-time offer of employment. Initial period of stay A grant of TN status is typically valid for three years, but only for the specific employer for which it was originally requested. A desired change of employers will require a new authorized period of admission in TN status, whether through the first-time route (TN status directly at the border for Canadian citizens; a new TN visa for Mexican citizens at a U.S. consular post and admission at the border) or via Extension of Stay as part of the new prospective employer's Form I-129 petition on behalf