it's a lot easier to recruit someone who's already inside than to send in a spy. just look at robert hanssen. or a bigger names like snowden, assange, chelsea manning.
not to mention there's already a legal way to do that known as sending in a diplomat/ambassador/consul.
there's a difference between denying a guy trying to work at raytheon or lockheed and a guy with a civil engineering degree trying to design a highway.
and this is all on top of a ban on all students from like 7 of the state universities that have ties to the chinese military industrial complex.
and moreover, why do you presume mexico would have no interest in US state secrets?
i can't speak on other ones, but as far as china goes, it really is only the latter part. you're free to leave as long as someone's down to take you. unfortunately that usually ends up only being australia because the US is more content to let mexican stragglers flip over barbed wire than a masters graduate student from the mainland enter even after getting a job offer.
i'm pretty sure russia operates similarly unless you've got important ties and could be a flight risk.
absolutely no idea how it works in the middle east though.
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