Usually the best proof is a return ticket and an occupation back home (school, job, etc.). IDK if the guy has bought a return ticket. Also I don't (and won't,

Usually the best proof is a return ticket and an occupation back home (school, job, etc.). IDK if the guy has bought a return ticket. Also I don't (and won't, I can't take what is described in tens of news articles to be the way the US Border acts) have any experience w/ American visas, just European.