The US is pretty much the only country that uses polygraphs with any frequency. In Europe [1] they are not used. The US needs to stop using the bogus devices.
Unfortunately, we still use them as part of a hazing ritual to get clearance for national defense projects. But the poster upthread is probably right that those kinds of projects aren't the ones you want to be working on anyways.
For instance the interrogator says, "the polygraph says you're hiding something from me, are you sure there isn't something you want to get off your chest."
The should however, be banned completely because the false positives are so high that we are crippling many of the agencies that rely on them. We're forcing them to drastically reduce their potential talent pool based on pseudo science.
Even worse than that, it selects for people who lie with impunity without any visible or emotionals qualms about it -- basically it selects for psychopaths.