The evidence should explain actual professional duties and the genuine terms as well.
Describe what the time is used for
Hours alone do not establish the profession. Include a clear account of responsibilities, compensation and anticipated activity.
A single description covering both phases, showing they are one professional assignment: the field program and its purpose, the interpretation and modelling that follow, the reports produced, the expected duration, and who within the employer directs and receives the work. A Canadian passport, the diploma with a transcript, employment letters covering the qualifying experience, and a signed offer letter from the U.S. employer describing duties, dates, salary and reporting line. Ask the hospital's recruiter for a letter on letterhead that names the legal employing entity, states that the applicant is being engaged as a Registered Nurse under the USMCA, and describes the unit and duties in clinical terms. Build the file from contemporaneous records: a detailed employer letter, agreement or offer, itinerary where useful, credential evidence and proof tying the signer to the engaging entity.