Once again, if a competent (underline competent) examiner is doing the test properly (underline properly), no one is going to beat him. I can't say much about the competence of a polygraph examiner who feels that he can be beaten.
There are two recent posts on my blog that deal directly with the inability of psychopaths and others to beat a [I]properly administered [/I]polygraph test. Scientific research has shown that it can't be done.
To see the posts, go to PolygraphReality.wordpress.com. I'll be happy to answer...