Re: I think I...
"OK. So if your servers are in a foreign country, like, for instance, Ireland, they are still subject to US jurisdiction if you're an American or a US Company, and you have to give US authorities any and all data on them if they ask."
No. If your servers are in a foreign country, they aren't protected by US law. Therefor obtaining data from those servers doesn't break US law. Therefor such data is admissible in US courts as evidence. Those servers are not subject to US juristiction.
If the owner of the server or the data stored on the server is a US entity, however, then they can be asked to retrieve the data and hand it over. Currently the legality of such a request is under question, particularly where the data pertains to non-US entites. This does not mean the FBI has the right to go and get the data itself.
In translation: The FBI broke the laws of the nation where the servers were located. The US courts don't care, however: As far as they're concerned, the evidence is admissible as no US law was broken. What the hoste nation, or hoste company for that matter, wish to do about this is up to them: The US courts aren't concerned with that: That's a mess for the US Government to clean up.