Do not decide from the payment name alone. The actual employment and service arrangement needs assessment.
Explain each organization’s role
Identify who offers and directs the work and what the relevant agreements establish. A payroll document may answer one question without resolving the entire employer relationship.
TN eligibility for a biologist generally rests on a qualifying baccalaureate or licenciatura degree; an adjacent-field degree requires assessment of its actual coursework against the profession rather than an assumed blanket exception, so compare the applicant's actual degree and area of study against that standard. TN requires prearranged professional employment with an employer in the United States, in a profession USMCA Appendix 2 names, held by a Canadian or Mexican citizen with the qualification that entry specifies. An employer letter that spends its length on salary, benefits and relocation while describing duties in a sentence leaves the central question unanswered. A multi-site assignment fails on the same grounds any assignment fails: duties that do not match a listed profession, a credential that does not meet the listing, or an employment relationship that is unclear. Ask the employer what role, if any, exists for the veterinarian before the licence is granted, and be careful with the answer: work that requires a licence cannot be performed without one, and describing it as observation or training does not change what it is. The employer letter, degree or other permitted qualification record, citizenship document, and a truthful description of the work usually settle the initial issue.