This study examined the predictive validity of the Hare Psychopathy Checklist: Youth Version (PCL:YV; A. E. Forth, D. S. Kosson, & R. D. Hare, 2003) from adolescence to early adulthood. The authors coded the PCL:YV using file information and collected criminal record information over a 10-year follow-up period on 157 boys, ages 12 through 18, referred to Youth Forensic Psychiatric Services for assessment in 1986. The risk for violence into early adulthood was greater among those with high PCL:YV scores than among those with low scores, even after controlling for conduct disorder, age at first offence, and history of violent and nonviolent offending. These results indicate that the PCL:YV provides meaningful information about young offenders' risk for violence into early adulthood. Clinical implications are discussed, with reference to pertinent ethical issues.