回复：Check 的结果是通知到中国领事馆吗?

I majored on physics.they can forward result to any consolate you choose in the world, they give you info for contacting them. you can wait in Mexico if you have Mexico visa but not wait in US, He might be wrong according to a friend's understanding of regulation follwing
http://travel.state.gov/visa_services.html
看看这段话
Effective April 1, 2002, aliens who have applied for and been refused visa
issuance while outside the U.S. are prohibited from returning to the United
States, even if they are in possession of a valid I-94 form. The revised
regulation also prohibits aliens who are citizens of countries on the State
Department's list of State Sponsors of Terrorism from re-entering the U.S.
using solely an I-94 form if their visa has expired 。

就是说如果签证没有被拒，而我们又不是State sponsors of terrorism的公民，就可以
享受Automatic Re-entry With Valid Form I-94。也就是说可以从canada或mexico回来
是合法的。
但是问题是一旦被check，I94会不会收走，还有回到美国境内后合法的逗留期限是多久