Nonverbal behaviour is not speaking or writing but it is transmittance of body movement. It is the mechanism that the investigator use to read the body language instead when the witness or respondent does not provide a good cooperation to speak or writ the information. Moreover, the investigator can also use to confirm the dishonest of witness or respondent by ask the question which these know answer. If the witness or respondent answers the expected question, they would be trustfulness.