The evidence should accurately describe the actual proposal.
Reconcile the current record
Identify material differences in duties, employer or terms and obtain appropriate updated evidence. A convenient old letter is not a substitute for an accurate account.
Hypothetical example: a prosthetics design technologist receives a letter naming a hospital customer, while the purchase order identifies an engineering vendor. The applicant should obtain a current letter that explains the actual employer, duties, location, duration, and remuneration rather than asking an officer to reconcile the discrepancy.
For TN, confirm citizenship of Canada or Mexico, a listed professional occupation, the required qualifications, and a genuine temporary employment arrangement. A Canadian citizen may seek admission at a designated inspection location or preclearance, while a U.S. employer may submit a Form I-129 petition to USCIS. Neither path permits substantive self-employment through a U.S. entity the applicant controls.
The first document review should produce a dated evidence index. For every important statement, identify the record that proves it, who created it, when it was signed, and whether a later document changed it. Compare names, dates, money amounts, duties, ownership, and locations across the file. When records conflict, obtain a correct present explanation and retain the earlier version; an unexplained mismatch can be more damaging than a disclosed update.