Who still believes that lie detectors can't be beaten?

With regard to recent discussion about how easy/difficult it is to beat a lie detector, this article is pretty illustrative of just how unreliable they are. (A man who committed a horrific murder when questioned by Police beat one easily. )

See: http://tinyurl.com/ydzr96h

I wonder how different things might have been if Police had not relied on a lie detector to eliminate suspects. Few agencies will do so nowadays.