Do they need U.S visa ?

My parents are visiting us in U.S.They arrived U.S last month.They are B2visa holder,Their visa is six month valid and Mutiple entry.If they like to visit Mexico for a week,Do they still need visa to reentry U.S when they back from Mexico? Thank for your reply .

所有跟帖： 

• 30天内返回不需要但在I-94期限内 -护照还是要带上- ♀ (0 bytes) () 04/04/2005 postreply 10:42:49

• 回复：30天内返回不需要但在I-94期限内 -nannan- ♀ (6 bytes) () 04/04/2005 postreply 11:39:55