[Sciolist]

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For example off the top of my head his ability to call down bluffs and fold strong but losing hands would increase.

So you take the hand histories and break them down into similar categories with the difference being the relative strength of the suspects hand. Then you compare them. If a player calls with A high when the opponent is bluffing but folds with A high when he is beat that is evidence.

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You'd never know this because you wouldn't know his holecards. All you will see are his holecards that go to showdown that he shows, as our sample size is going to be datamined.