Multiple work locations should still describe one coherent professional assignment

A Carignan applicant may receive an offer involving several facilities. Organize the actual employer, duties and locations before preparing TN evidence. A list of addresses does not explain the professional activity, and a familiar job title does not show who has arranged the work. A first review should produce a single duty-and-employer map: who signs the offer, who pays the professional, where services occur, and whether each task fits the named USMCA profession. The record that usually resolves uncertainty is the signed employer letter supported by contracts or assignment schedules, not a travel itinerary. Canadian applicants may request TN classification at inspection or preclearance, or an employer can seek an I-129 classification request with USCIS; Mexican applicants generally need a TN visa. The route is for temporary prearranged professional employment, not self-directed U.S. business activity. Hypothetical example: a wildlife economist has one offer letter from a consultancy but spends two days each week at a client’s facility. The decision is whether the consultancy remains the actual employer and whether the letter explains the client work; the service agreement and payroll records provide the needed context.