[BluffTHIS!]

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But you know it because of the color of his skin.

Or because his house was searched without a search warrant.

Or because of Nazi experiments.

Should you play against him and use this information?

In all cases assume you found these things out strictly through innocent reading.

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From the examples you give, it seems like the information would be available to everyone at the table, including the suspect himself. If the information is available to everyone, then I use it. I can't be responsible for someone else's neglecting to notice all the info available to him.

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The question is does HE know that his opponents (or at least some of them and maybe even just one) know this about him? If the answer is yes and he chooses to play anyway, then he's just a sucker and you should take his money.


However if that's not the case, then the answer (for those who care about ethics/morality), can be determined from the answers to the following questions:

1) Do the ends justify the means?

2) Do you have an ethical obligation not to take unfair advantage or not?

3) Will your using this information against him somehow make it more likely that the wrong actions that made that information available will be repeated?