Teaming up/percentages question

I posted this in another forum in response to the Hasan Habib interview but realized that this might be the more appropriate place for it.

When you're in a NL cash game at a casino do you look to see if you can spot others at your table that are teaming up? If so what do you look for? I play at the Bike in LA at their 100 NL game (maybe once a week at the most becuase my job keeps me pretty busy) and I haven't really given any consideration that others may be taking a percentage and would lay down some hands. Do you think this goes on a lot?