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How do polygraph tests know numbers?

Asked by troubleinharlem (7991points) March 10th, 2011

I’m bored, it’s raining, I ran out of books to read, my mom has the car and Maury is on.

So!

How do polygraph tests know numbers? There are questions like “Did you sleep with your ex-girlfriend blah blah blah blah”, and the answer would be “Yes, more than 20 times”. How could the polygraph test know numbers?

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