[unclebucknasty]

>I imagine the investigation would be over very quickly

You're most likely correct. I'd add that even with the agents being human beings, there may still be some protocol that they are compelled to follow in vetting the host. I'd want to know that going in.

That's still not to say that this would end badly for the host. It's just that, given that the tone of the response is correct (even if shortened) , there is clearly more involved. And, when you have a representative of an agency with pretty broad powers, deep resources, and potential mandates soft-pedaling what's at stake, it can have a pretty ominous feel to it.