False confessions are a leading cause of wrongful convictions. According to the Innocence Project, about 25 percent of the documented DNA exoneration cases involved incriminating statements, full confessions or guilty pleas by innocent suspects.
The polygraph is an important tool in the extraction of false confessions. Despite the well-documented inaccuracy of the polygraph, police in North America (less so in Europe and other areas) still rely heavily on the “lie detector” and its even less accurate cousin, the voice stress analyzer, in the investigative process. If an innocent suspect fails the polygraph exam, police will use the results to persuade him or her that they must be guilty. In some cases, police will tell the suspect that they failed the exam even when they didn’t in an attempt to obtain a confession.
Given the polygraph’s inaccuracy and record of being used to obtain confessions, I am continually amazed to come across cases in which defense attorneys Continue reading





