One method that I found to work is to go ahead and just pick one of the players at random. Usually, he will protest and tell you who really said it - then you just change your call.
And....if he doesn't protest, it means one of two things - either he was the correct one, or he wasn't but doesn't want to rat out his friend. Either way, you've doled out the correct punishment against their team.
If the wrong player gets the T, tough. It's only a game, anyway.
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Yom HaShoah
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