I haven't tried Absynthe, however I have looked into it... It is legal in England, and as such may be imported to the US via mail. However, it is still illegal here, so I suggest you not get caught with it.
Absynthe in it's raw form is a type of poison, hence the need to dilute it. I don't remember the methods, a friend of mine searched for it and found some different ways to process it so it wouldn't be lethal. However, if anybody is interested in trying it, I'd say be careful, from everything I've heard about it, it's a very dangerous hallucinogenic type drug with poisonous properties if not processed correctly.