I changed my status from F2 to H4 last month (got a new I-94 card). I went to Toronto last week try to get a H4 visa stamp allow me return to USA from China. The visa officer issued the visa but warned me the visa can be only used return to USA from Canada. When I\'m back to the US, the boarder police does not notice the new visa stamp and just checked my I-94 card. I compared my visa stamp with my friend\'s visa stamp (H1B) (he also got the visa stamp from Toronto and will use that return to USA from China), mine has only 1 entries but his has 2 entries on the stamp. I want to know if I can still use this visa stamp return to USA from China. Your help is very much appreciated.