In one case, four burglars were apprehended through the modus operandi system of police investigation. The polygraph examination determined that they had not committed this particular crime. The next day, another suspect was brought in for questioning. His violent fluctuations in blood pressure during the interrogation determined his guilt and, as a result of the examination results, he confessed to the burglary. The inventor points out that the polygraph technique is particularly useful in investigating crimes such as bank embezzlements, where there are large number of suspects and the evidence points strongly to inside knowledge. Map location is one specific polygraph technique described in this article.