Fake double deck
It is the latest scam by casinos to separate the unwary from their bankroll.
A modified Casinovisions Random Ejection Shuffler loaded with eight decks is used. This is a CSM that, instead of spitting the cards out one at a time, produces a pack of 104 cards. The dealer then removes the pack from the shuffler and deals as though it were a conventional double deck game. That is, the cards are dealt face down, the players handle the cards, etc.
So, at a glance, it looks like a double deck game, but is in reality an 8 deck shoe with only two decks penetration. It has the same house advantage as an 8 deck game with the same rules, and of course, any attempt at counting is a waste of time (not to mention money).
Most (but not all) casinos will have a small sign somewhere on the table that reads, "Handheld Multi-deck Game" or something similar.
Note that a Random Ejection shuffler is often used in real double deck games as well.
The quickest way to spot the fake game is to look at the backs of the cards in play, and compare them to the backs of the cards in the shuffler. If it is a real double deck game (using two packs) the cards in the shuffler will have different color backs than those in play.
If they are the same color, beware.