Why are polygraph test are not reliable?

The answer to this question lies somewhere between "completely foolproof" and "worthless," depending on who you ask.

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Polygraphs measure changes in respiration, heart rate, b…lood pressure and galvanic skin response (perspiration, basically) as the subject is asked a series of questions. The theory is that subjects will experience stress when trying to hide information, and that the stress will be reflected in their physiological measurements. Even the most outspoken proponents of the polygraph agree that the skill and integrity of the operator are critical to a reliable polygraph exam. Almost anyone can learn the mechanics of how to operate a polygraph, but the best polygraph examiners are also specialist interrogators. They set the stage so that the subject is encouraged to believe that any attempt to lie will be discovered immediately, so there's no point in trying to beat the test. When subjects "confess" and recant a prior exculpatory statement, it's far more common for this to happen during a pre-exam or post-exam interview than during the test itself.

Angels in Greco-Roman Religion and Polytheism The Augustine’s argumentation is a good example to an alternative reading of the already existent terminology for the divine. Cline focuses to the study of the Greco-Roman understanding of angels and how they have been worshiped.
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