Liar Liar,

Whether or not the polygraph is a valid test has nothing to do with whether a particular person "passed" it or not.  Mr. Maschke has argued compellingly, persuasively, and substantively that the polygraph does not withstand scientific scrutiny.  Whether he passed or failed twenty polygraph tests is irrelevant.  

If Beech Trees played Russian roulette and survived, would you be asking him why he is critical of that game?

In case you're wondering, I was an FBI agent for 9 years.  I am proud to say that I "failed" a polygraph.  More accurately, the polygraph examiner misinterpreted my physiological reactions as indicating deception when in fact I was being truthful.  By the way, after investigation, I was exonerated.