memorizing sequences of cards?
Here's a good article that surveys casino security at Foxwoods and Mohegan Sun.
I was unimpressed with the sidebar, though. Titled "common casino scams", it lists card counting and defines it as "A patron memorizes the sequence of cards and uses it to guess the hand." First off, card counting isn't a scam, it's merely playing with an unusual degree of skill. Second, card counting does not involve memorizing sequences of cards. There are techniques that do involve that skill, but they don't really constitute counting. The right name for that class of behavior would be sequence tracking (or, to a lesser degree, shuffle tracking).
Perhaps they should have just listed "playing intelligently" as one of the "scams" security watches for.