Prosecutors in the US are notorious for trying to obtain convictions at the expense of justice. In doing so, they will resort to all manner of dubious methods and what has come to be known as ‘junk science’, evidence that seems scientific but has not been shown to be reliable or consistent, is one such technique, using such methods to persuade judges and juries to convict. These junk science theories are advanced by people who pose as expert witnesses in cases, usually on the side of the prosecutors, while judges and juries are not made aware that these methods are unreliable. These so-called experts make a living by being ‘expert witnesses’ in cases and providing ‘training’ to police and police officers.
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