Question about Raymer's hand

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Why does everyone think that hands get killed automatically when they are shown? Being penalized is one thing but I have never heard of any card room killing your hand if it's exposed at the wrong time... tournament, side game or otherwise.

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I have played in tournaments where a hand was ruled dead if it was exposed to live players. I don't know how common this is, but I've seen it happen. I think they compare it to a string bet in the sense that one shows their hand to gauge their opponents reaction before deciding what to do.