A polygraph, or a lie detector, is a device used to detect duplicity by replicating a subjects inner reactions on a scroll of paper. A subjects reactions to a particular yes or no question would then be recorded on to one of the multiple graphs the polygraph produced. Many people feel as if a polygraph is the key to figuring out whether a person is either innocent or guilty when investigating crimes such as murders but, what they may not know is that a polygraph cannot fully be trusted. In the article “Where the Truth Lies” by Wayne Grady, the author’s underlying message of a polygraph being unreliable and how they cannot be fully trusted is effective because of the author’s ability to use specific examples to back up the message, the author
