... Further studies looked into verbal and non verbal cues. Some examples of verbal cues include higher pitch voice, speech hesitations and taking longer to answer questions. Some examples of non-verbal cues include twitching, pupil dilation, avoiding eye contact and increased sweating. However, Ekman (1974) later stated that no body movement, facial expression or voice change is an indisputable sign of deceit. However many people that are trained in lie detection are still taught to use these methods to detect deception. So how good are people at lie-detection? Some studies show that the people who one would expect to be good at lie detection are fairly accurate (eg. Police officers). A recent study by Mann, Vrij and Bull (2004) showed that when shown videotapes of real-life lies and truths and found that the officers had an accuracy of 65%. This was found to be better than lab studies using, normal (non-trained) participants. ...

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