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Explaining reliability and validity of polygraph examinations is not a simple task, since many circumstances must be taken into account to conduct proper polygraph examinations.
The validity of the polygraph examination depends basically on agreements between prosecution and defense or by rulement of judges.
In Europe, not many attemps have been made to introduce polygraph examinations into European courts, so there is a popular perception in society thinking that polygraph examinations are not valid in courts. This is true until the first qualified attempt is accepted by justice. Unfortunately, the lack of trained Polygraph Examiners in Europe and the misconception of polygraph examinations by defense lawyers have not yet allowed a real debate about this instrument that is a vital tool to improve judgments and increase safety of the society.