Yes, they are. In fact, just a few miles from me yesterday, a family in Lacey, Wash. had several of their Pachislo slots siezed and even the Pachinko machines too! It was on the tv news yesterday and on the front page of the local newspaper, The Olympian.
Despite the fact that the father stated these machines only operate on tokens and pay out tokens, the State took the machines anyway. The guy had a really nice gameroom in his house too which included a Bally Supersonic pinball, a couple of video arcade games, airhockey, and pool table (all of which used coins BTW).