Klaus Stüllenberg and Susanne Stubbe conducted a recent polygraph study for the German Foundation for Crime Prevention (Stiftung Kriminalpraevention). Their key conclusions are:

• A trained subject can manipulate the results of a Polygraph test even when administered by an experienced examiner.
  
  
• Polygraph tests can no longer be used as an indication of truth.
  
  
• Polygraph tests can divert legal processes because they are not accurate.
  
  
• Judicial systems and law enforcement administrations should no longer accept the results of polygraph tests as any indication of truth by the individual being examined.
  
  
• All polygraph testing for legal and criminal purposes should be repudiated immediately on a worldwide basis until further scientific research can verify the findings of the German Foundation for Crime Prevention.
  

More on this study is available on-line in English at:

http://www.institut.de/praev/Polygraph_engl.htm

And a more detailed description in German is available here:

http://www.institut.de/praev/Polygraph.htm

The researchers also note:

Quote:

The APA (American Polygraph Association) has been contacted by the researchers in order to discuss these controversial results but the APA terminated communication and rejected the possibility that the results of a polygraph test could be manipulated with training.