The contract that shows who actually employs and directs the professional. If an agency places the applicant at a hospital or client, the file must show the agency as employer and the placement as prearranged professional work, with both relationships documented.
Show the whole chain from payer to work site
Hypothetical example: a Sainte-Brigitte-de-Laval pharmacist is recruited by a U.S. staffing agency to work at a hospital that is the agency's client. The applicant will be paid by the agency and supervised day to day at the hospital.
TN permits this arrangement, but the file must not present the hospital as employer when it is not, and must not leave the agency's role unexplained. The support letter should come from the agency as employer, state the profession and qualification, and identify the client site and the expected duration; a letter from the hospital confirming the placement and the professional nature of the work strengthens it. Include the agency's service agreement with the client, redacted for price if necessary, so the officer can see the placement is prearranged rather than speculative.
Where the agency can move the applicant between clients, say so and explain that each placement will be professional work in the same occupation. The state pharmacy licence remains a separate requirement that the agency cannot waive, and the file should show it is issued or its date.