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A laboratory assignment involving an employer and a separate customer should identify the actual professional work and each party’s responsibilities. TN requires Canadian or Mexican citizenship, a listed profession and its qualification, prearranged professional activities and temporary entry. A laboratory setting or a chemistry-related title does not establish those elements on its own. Before choosing a process, separate eligibility from presentation. A Canadian applicant may request TN classification when seeking admission or at preflight inspection; where the facts call for petition processing, the U.S. employer may submit Form I-129 to USCIS. The route does not permit the applicant to provide professional services through a U.S. business that the applicant solely owns or controls. A first review should produce a duties map, a qualification checklist, and a clear account of who will employ and supervise the professional. Ask the employer to choose one current, truthful assignment description before producing supporting records. If duties are expected to change after admission, record that commercial uncertainty instead of presenting a fixed role that the parties do not actually intend. Finally, retain the version of the duties statement that was current when the process was chosen. A later customer change should trigger a fresh accuracy check, not an informal substitution in practice.