The FDA has banned thujone (a chemical component in wormwood, which is a main ingredient in most absinthes) as a food additive. This ban still stands. IIRC the new US absinthes had to prove they had a very low/no thujone content in order to be able to sell the products. Therefore it is not a case of them now being legal insomuch as they have circumvented the thujone ban.

That being said, La Fee Absinthe is a good one. Hill's is over rated (marketing). Stick to absinthes that aren't overly green (the color is synthetic and it just has more additives).