Can you spot when someone is lying?

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Of course, this is easy when the person in question is a politician - they open their mouths and words come out. However, for most of us this is not so easy, although various strategies have been suggested that can be used to detect when what you are being told is not the truth - these being ones that apply when you are face to face with the supposed liar. * The person looks to the right when talking to you * They fidget * They scratch their nose * They hold their own hands * Their pupils dilate * They speak in a higher-pitched voice than normal * They tend to repeat words * They are more negative Clearly this is a mixture of verbal and non-verbal clues, and some people lay greater stress on one type than the other for detecting a liar. Have you found any of these to be valid or invalid for you? Do you have any other suggestions?