Short answer
A TN support letter for a scientific technician/technologist is written by the U.S. employer and should cover the TN profession, the job’s professional activities, the length of stay, your credentials and your pay. For this category, the letter also names the professional the technician works in direct support of, and a degree is not required. Source: 8 CFR 214.6(d)(3), USCIS Policy Manual.
What a scientific technician/technologist letter must contain
No government form exists for the letter. Under 8 CFR 214.6(d)(3)(ii), the documentation for a Canadian applicant should describe the profession, the professional activities with a summary of daily duties, the anticipated length of stay, the applicant’s educational qualifications or credentials, and the arrangements for pay. For Scientific Technician/Technologist, three details deserve extra care:
- The list entry, quoted exactly: “Possession of (a) theoretical knowledge of any of the following disciplines: agricultural sciences, astronomy, biology, chemistry, engineering, forestry, geology, geophysics, meteorology, or physics; and (b) the ability to solve practical problems in any of those disciplines, or the ability to apply principles of any of those disciplines to basic or applied research.”
- The direct-support relationship. The annotated list adds: “A business person in this category must be seeking temporary entry for work in direct support of professionals in agricultural sciences, astronomy, biology, chemistry, engineering, forestry, geology, geophysics, meteorology or physics.” USCIS guidance says the supervisory professional must individually qualify as a professional in one of those disciplines, and describes the technician’s work as managed, coordinated and reviewed by that professional. This sample’s letter has a “Direct support” paragraph naming the professional, their title, profession and credential, and the discipline.
- How the theoretical knowledge is shown. A degree isn’t required. USCIS guidance says the knowledge is generally shown by at least two years of training in a relevant educational program, documented by a diploma or certificate, or by extensive work experience directly related to the profession. This sample shows a diploma in the discipline plus six years of technical experience, matching the documents the applicant brings.
Annotated sample letter for a scientific technician/technologist
Fictional example. Every name, company, address, date and salary below is invented to show the structure. Your letter must describe your real job, confirmed by your employer.
January 15, 2027
U.S. Customs and Border Protection
U.S. Department of Homeland Security
Re: Request for TN classification for Liam Thomas Example, citizen of Canada
Profession: Scientific Technician/Technologist (USMCA, Chapter 16, Annex 16-A, Appendix 2)
Position: Laboratory Technician
Requested period: Three years, February 1, 2027 through January 31, 2030
Dear Officer:
Example Analytical Laboratories Inc. (the “Company”) respectfully requests that Liam Thomas Example, a citizen of Canada, be admitted to the United States in TN status under the United States-Mexico-Canada Agreement (USMCA) to work for the Company as a Scientific Technician/Technologist in the full-time position of Laboratory Technician.
About the Company. Example Analytical Laboratories operates a commercial laboratory that performs chemical testing of water, soil and industrial samples for municipal and industrial clients. The Company is located at 850 Sample Court, Suite 300, Raleigh, NC 27601.
The position. As Laboratory Technician, Mr. Example will perform scientific technical work in chemistry, reporting to the Company’s Laboratory Director. The position is based in Raleigh, NC. Mr. Example’s principal duties will include:
- Conduct laboratory or field tests and experiments under the direction of the supervising scientist or engineer.
- Set up, calibrate and maintain scientific instruments and test equipment.
- Collect, prepare and analyze samples using established scientific methods.
- Record, compile and interpret test data, and report results to the supervising professional.
- Apply scientific principles to troubleshoot test procedures and resolve technical problems.
- Prepare technical reports, charts and summaries of findings for the supervising professional’s review.
Direct support. Mr. Example will work in direct support of Daniel Robert Sample, the Company’s Laboratory Director, who is a Chemist (Ph.D. in Chemistry). Daniel Robert Sample will manage, coordinate and review Mr. Example’s work. Mr. Example’s work will directly support Daniel Robert Sample’s professional work in chemistry.
The TN list of professions (Appendix 2 to Annex 16-A of the USMCA, set out in 8 CFR 214.6(c)) states the minimum requirement for Scientific Technician/Technologist as: “Possession of (a) theoretical knowledge of any of the following disciplines: agricultural sciences, astronomy, biology, chemistry, engineering, forestry, geology, geophysics, meteorology, or physics; and (b) the ability to solve practical problems in any of those disciplines, or the ability to apply principles of any of those disciplines to basic or applied research.” The annotated list in 8 CFR 214.6(c) further provides: “A business person in this category must be seeking temporary entry for work in direct support of professionals in agricultural sciences, astronomy, biology, chemistry, engineering, forestry, geology, geophysics, meteorology or physics.”
Mr. Example’s qualifications. Mr. Example holds a post-secondary diploma in Chemical Laboratory Technology (Example College, 2018) and has six years of technical experience in chemistry (analytical testing in environmental laboratories).
Length of stay. This is a temporary position. The Company anticipates requiring Mr. Example’s services for a period of three (3) years, beginning on or about February 1, 2027 and ending on January 31, 2030.
Remuneration. Mr. Example will be employed full-time, working 40 hours per week, at an annual base salary of US$62,000, paid through the Company’s U.S. payroll. Mr. Example will also be eligible for the Company’s standard employee benefits.
We respectfully request that Mr. Example be admitted in TN status as a Scientific Technician/Technologist for the period stated above. Please contact me at [email protected] if you require any further information.
Sincerely,
Daniel Robert Sample
Laboratory Director
Example Analytical Laboratories Inc.
What each numbered part is doing
- The Re: block names the applicant, “citizen of Canada”, the TN profession exactly as it appears on the list (“Scientific Technician/Technologist”), the job title and the requested dates.
- The request connects the employer, the applicant, the TN profession and the position in one sentence.
- About the Company says what the employer does, in its own words, and where it is.
- The position and duties carry the case. Every duty describes technical work in the discipline, done under the supervising professional’s direction: tests and experiments, instruments and samples, recording and interpreting data, troubleshooting, and reports for the supervisor’s review. None of them is construction-trade work.
- Direct support names the supervising professional, their title, profession and credential, and says they will manage, coordinate and review the work — the relationship USCIS guidance describes for this category.
- The minimum requirement quotes the list entry word for word, including the annotated note about direct support.
- Qualifications state the training and experience the applicant actually has — the diploma, its school and year, and the technical experience in the discipline — matching the documents they bring.
- Length of stay says the job is temporary and gives dates, up to three years.
- Remuneration states pay, hours and the U.S. payroll.
This sample was generated by the same engine that builds TNPath letters, from fictional answers. The diploma-and-experience route is shown, in chemistry, in direct support of a chemist. In another discipline, or on a different training history, the letter names the discipline, supervisor and credentials you actually have.
Common scientific technician/technologist letter mistakes
- Working independently. Duties that describe sole responsibility, or approving professional work yourself, read as professional work rather than technical work in direct support of a professional. USCIS guidance describes the technician’s work as managed, coordinated and reviewed by the supervising professional. If you’ll mostly work independently, consider an independent review by a U.S. immigration lawyer.
- Construction-trade work. Welding, carpentry, electrical installation and similar trade work sit outside this category: USCIS guidance says it isn’t for work normally performed by the construction trades.
- A professional job title. Titles such as Chemist or Engineer name the professional role, not the support role. USCIS guidance says the job’s primary activity decides the category, not the title. Keep the real title, and make sure the duties honestly describe what you do.
- No named supervisor. A letter that doesn’t name the professional you’ll support, their credential, or how they oversee the work leaves out the relationship this category turns on.
- No dates or pay. A letter without a period of stay or pay arrangements leaves out elements the regulation describes, and officers focus on a clearly temporary stay with defined dates.
Never add or inflate duties to fit a category. Every line should be something your employer will confirm and you can describe in your own words at the border.
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Common questions
Is there an official TN support letter for scientific technicians/technologists?
No. There’s no government form. The regulation, 8 CFR 214.6(d)(3), describes what the employer’s letter should cover, and the sample on this page is one way to lay it out.
Do I need a degree for TN Scientific Technician/Technologist?
No. The list entry doesn’t name a degree. It requires theoretical knowledge of a listed discipline plus the ability to solve practical problems in it or apply its principles to research. USCIS guidance says the knowledge is generally shown by at least two years of relevant training, documented by a diploma or certificate, or by extensive directly related work experience. TNPath doesn’t assess whether your evidence is sufficient.
Who counts as the professional I support?
USCIS guidance says the supervisory professional must individually qualify as a professional in one of the listed disciplines, such as a chemist, biologist, geologist or engineer. Your letter names that person, their title and their profession. TNPath doesn’t assess whether a particular supervisor meets the guidance.
Who signs the letter?
Someone at the U.S. employer with authority who knows the role, such as the hiring manager or an HR representative, on company letterhead.
Will TNPath tell me whether I qualify?
No. TNPath is a document-assembly tool. It organizes the facts you provide into templates and gives general information. It doesn’t make eligibility determinations or recommend case-specific strategy. Only U.S. Customs and Border Protection decides whether to admit you.
Sources
- 8 CFR 214.6: Citizens of Canada or Mexico seeking TN status (Cornell LII)
- USCIS Policy Manual, Volume 2, Part P, Chapter 6: Requirements for Specific Occupations
- CBP: Traveling on a TN visa or L-1 from Canada
Last reviewed October 19, 2026. General information, not legal advice. Rules change; confirm with official sources before you travel.