Due to an accidental oversight in EU law Absinthe is now legal in Europe and several manufacturers are attempting to put it back in production, but but most is rot gut.
Analyzing bottles of "pre-ban" absinthe did no good since nearly all fake.
An American chemist has come up with the best recipe (by a very wide margin, I hear) and believes it's the real stuff. He's having it manufactured in Europe because it's still illegal in the U.S. (though that is being worked on).