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Its not quite that clear:

https://en.wikipedia.org/wiki/Polygraph#United_States

But, last I checked, polygraphs were required for certain government positions in the U.S, but am having a problem finding a citation for that right now.

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Ah, yes. I was speaking only in the context of a criminal investigation/prosecution. The page you linked states: While polygraph tests are commonly used in police investigations in the US, no defendant or witness can be forced to undergo the test

It appears some states may allow the results to be presented, but sounds like it cannot be required.

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