more than $1000
Stoetling Polygraph
You might have to read a few manuals to learn how to use a Stoetling Polygraph. We are not looking at a cheap, novelty lie detector. This is a scientific instrument, a polygraph and when used correctly, it will indicate when a person is being less than truthful. Retail price for a new polygraph is typically around $2,000 , and they can be hard to find.
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