Here is the relevant information from: http://www.unh.edu/oiss/h_o_tn/tn/tn.html
Travel Outside the US and Re-Admission in TN Status
A foreign national in TN status may leave the US and be re-admitted for the remainder of the period of authorized stay as indicated on Form I-94 as long as the original intended professional activities and employer have not changed.
In these cases, the scholar should not surrender Form I-94 upon leaving the US. Upon re-entering the US, the TN holder should present the original, valid Form I-94 to the immigration officer.
If the scholar no longer has the original Form I-94, but the period of initial admission has not lapsed, alternative evidence may be presented such as the original fee receipt for admission in TN status, or a previously issued admission stamp as TN in a passport, and a letter confirming continued employment from the US employer.
回複:TN I-94 card 問皮匠等高手
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• 回複:回複:TN I-94 card 問皮匠等高手 -xiaotaosu2- ♀ (14 bytes) () 03/12/2010 postreply 20:40:12