According to social psychologist A. Daniel Yarmey, police officers find the nature of their work necessitates that they behave to some extent like applied psychologists. Many police officers, of course, do not have any special training in this or any allied field, nor do they have an understanding of what cognitive or social psychology might be able to tell them about the behavior of those with whom they are likely to deal in their daily work. Similarly, psychologists are habitually asked by the courts to present research regarding eyewitness testimony, forensic evidence, and competency to...