In the past, police relied heavily upon eyewitness testimony to obtain criminal convictions. The problem with this approach is that sensory perception isn't always reliable, and is sometimes the source of egregious errors, as both Eastern and Western philosophers have noted for centuries.
過去判定犯罪事實，非常依賴目擊證人，但就像中西方哲學經常討論的問題：感官所覺知的，不一定真實，甚至可能是謬誤的根源，刑事鑑識甚至可推翻目擊證人的說法。