The idea to use a lie detector test came from Robert De Niro while he was researching a role. He read up on polygraphs and presented his findings to Jay Roach at a pre-shoot dinner. "At that point, there was no lie detector scene in the script", Roach told Entertainment Weekly. "But after hearing all this, I thought, 'Oh, this has to be in our movie.' Now it's become the central image of all the ads, the trailers, everything." Jack Byrnes, being ex-C.I.A., was always part of his character since the beginning.

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