[mrmr]

Do they use shuffling machines at the Rio?

At another casino, I noticed some marked cards and asked for a new deck. In the new deck, I saw more marked cards and asked for another new deck. The dealer spread the whole deck and showed me (and the whole table) that almost every card had at least one corner "marked" and many had all four corners marked. He said the shuffling machine does it, they all have it, all decks, and it really is nothing to worry about.

A new setup arrived at that time, and sure enough, this third deck also had tons and tons of marked cards.

I let it go, covered my own cards well, and had no reason to believe anyone at my table was playing with an unfair advantage, based on results.