回复：回复：回复：回复：question about I94

Thanks anyway. But I still warry about it. If they didnot take I94 back, how came USCIS or whatever office know what time a person left US. That I-94 only has once entry permit, Visa is B-2.

About your question, at airport, they do check passport, and seems read the visa page, but donot check I94 in my case.