How to tell if someone is lying? Carefully. All methods of lie-detecting, including polygraph machines, are regularly fooled 或者 used improperly, resulting in mistakes. There are a few good ways described here, but try to 确认 the truth 由 other means as well, such as confession 或者 investigation of the facts.
You should compare behavior in the person under suspicion to their "base" behavior, if possible. In other words, if they always have shifty eyes, then this trait can't be considered as an indication of lying. On the other hand, if they are normally very calm under pressure, but start...
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