In the mid-1970s, as a social psychologist dedicated to the application of knowl edge, I welcomed our field's emerging interest in the legal system. I have al ways been fascinated by jury trials-something about the idea that two con ceptions of the truth were in irrevocable conflict and jurors could choose only one of them. More important, the criminal justice system is a major social force that has been ignored by social psychologists for most of the twentieth century. As I systematically began to explore the applications of social psycho logical concepts to the law 20 years ago, I...