Neil Krishan Aggarwal's timely study finds that mental-health and biomedical professionals have created new forms of knowledge and practice in their desire to understand and fight terrorism. In the process, the state has used psychiatrists and psychologists to furnish knowledge on undesirable populations, and psychiatrists and psychologists have protected state interests.

Professional interpretation, like all interpretations, is subject to cultural forces. Drawing on cultural psychiatry and medical anthropology, Aggarwal analyzes the transformation of definitions for normal and abnormal...