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This was an interesting, if dry, look at the initial creation of the polygraph, early cases, and how lie detection devices have evolved. It is also a tale of injustice, of guilty people going free and innocent people being executed, based on a device proven inaccurate. The polygraph won't die, but people do because of it. I found this to be heartbreaking and anger-inducing. It's one more example of how the justice system in the US is unjust.