Behavioral Sciences and the Law Behav. Sci. Law 22: 49–67 (2004) Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/bsl.573 Psychopathy Scores and Violence Among Juvenile Offenders: A Multi-Measure Study Daniel C. Murrie, Ph.D.,* Dewey G. Cornell, Ph.D., Sebastian Kaplan, M.Ed., David McConville, M.Ed., and Andrea Levy-Elkon, M.Ed. This study examined the relations between psychopathy scores and violent behavior in 113 incarcerated adoles- cents. We compared the results of four different instru- ments designed to assess psychopathy features among juveniles—the Psychopathy Checklist: Youth Version (PCL:YV), two versions of the Antisocial Processes Screening Device (APSD), and a Psychopathy Content scale on the Millon Adolescent Clinical Inventory (MACI). We found that PCLY:YV scores were significantly correlated with violent offense history, unadjudicated vio- lence, and institutional violence, as well as measures of the severity and instrumentality of prior violence. Receiver operating characteristic analyses generated statistically significant effect sizes (AUC values) ranging from 0.64 to 0.79. The three other measures generated statistically sig- nificant correlations with one or more of the violence criteria, although correlations and effect sizes tended to be smaller in magnitude. Our results offer some support for the validity of these measures of psychopathic features, and the value of the PCL:YV in particular, with respect to short-term measures of violence outcome among juvenile offenders. Copyright # 2004 John Wiley & Sons, Ltd. Among adults, psychopathy is a robust predictor of criminal violence (Salekin, Rogers, & Sewell, 1996). Psychopaths are more likely than non-psychopaths to have Copyright # 2004 John Wiley & Sons, Ltd. *Correspondence to: Daniel C. Murrie, Department of Psychology, Sam Houston State University, PO Box 2447, Huntsville, TX 77341-2447, U.S.A. E-mail: murrie@shsu.edu Dewey Cornell, Sebastian Kaplan, David McConville, and Andrea Levy-Elkon are with the Virginia Youth Violence Project and Programs in Clinical and School Psychology, Curry School of Education, University of Virginia. We gratefully acknowledge the University of Virginia’s Center for Children, Family, and the Law for supporting the research that resulted in this article. We thank Stan Hannah for his assistance in data collection. We also thank Livia Jansen, Ph.D., Dennis Waite, Ph.D., and colleagues at the Reception and Diagnostic Center, Virginia Department of Juvenile Justice.