what Griffin does
Griffin lists thousands of players as "21 cheats", these players don't actually cheat, of course, but they count cards. Griffin views card counting as "cheating". When Griffin sends a casino information labelling a player as a "cheat" sometimes they include how the person cheats, e.g. marking cards with ink, bending cards, etc., but they don't always indicate how the person cheats, particularly with "21 cheaters". The employees of a casino have almost no leeway in how they implement the policies of the casino they work for, the policy will say "if a player is listed by Griffin as a cheat, they are immediately barred and escorted off premises", the fact that Griffin doesn't say how the player cheats and lumps card counters in with "cheaters" and calls counters "21 cheats" is not taken into account. So, if your name and picture are in the Griffin book then you won't get to play anywhere for very long. Obviously, Griffin's actions are damaging to counters.
Now, if you think that only "high rollers" get into Griffin you are mistaken. It is quite easy for a player to end up in Griffin. Any pit critter, at any time, can call Griffin up and ask for info on you, they will have the eye in the sky get your smiling face on camera and the Griffin agent will be looking at your face and then will try to match you with their database, either against your picture or the information the pit critter has on you, guess what, though? If there is no match and the pit critter told Griffen that they thought you were "cheating", Griffin will add you to their database as a "21 cheat"!! And, since casinos view counting as cheating they won't have to specify how you are "cheating", the Griffin agent knows anyway that you are a counter, but they don't care.
I have worked as a consultant to the casino industry, I am a computer consultant, not a gaming consultant, but I have been in the survellience room working on the computer system when this was going on, so I have seen it with my own eyes.
Also, I was talking to a pit supervisor of a casino in Biloxi trying to find out what level of play I needed to play at to get air fare, lodging, and meals comped 100% and the woman went on and on about how they use face recognition and player information databases to keep out "21 cheats" and "teams". I never quite understood why she went into all of this with me, I asked her though how many players were in these databases, and she said "thousands", probably "tens of thousands".
This is one of the reasons, but not the only reason, that Grosjean is going after Griffin and why this case is so important. Griffin dispenses inaccurate and blatantly false information which makes it so that players cannot pursue what may be their livelihood or at least a favorite pasttime. Most casinos accept anything that Griffin says as the gospel and don't try to validate the information. Also, Griffin obtains this information illegally because you never gave them permission to get your picture and you never gave the casino permission to share your confidential information with Griffin.
Steve