Although many medical judgments and legal issues hinge on the extent to which someone is actually in pain, to date there has been no objective way to make that assessment. Thanks to the work of Stanford School of Medicine's Dr. Sean Mackey, that is starting to change. Join the Center for Law and the Biosciences and the Stanford Interdisciplinary Group on Neuroscience and Society as Dr. Mackey discusses his work. Stanford Law School's Lisa Douglass will comment on the legal ramifications of Dr. Mackey's work.