In this study, the author investigates whether the opportunity to attend a school other than a student's assigned neighborhood school reduces criminal activity, especially among disadvantaged youth. Many of the schools chosen by the students were "better" on traditional indicators, such as student test scores and teacher characteristics. All of them, however, were preferred by the applicant over the default option. The analysis therefore sheds light on whether efforts to expand school choice can be an effective crime-prevention strategy, particularly when disadvantaged students can gain access to "better" schools. He compares the criminal activity of students who won the lottery to attend their first-choice school to that of students who lost the lottery. He finds consistent evidence that attending a better school reduces crime among those age 16 and older, across various schools, and for both middle and high school students. The effect is largest for African American males and youth who are at highest risk for criminal involvement. In general, high-risk male youth commit about 50 percent less crime as a result of winning the school-choice lottery. They are also more likely to remain enrolled in school, and they show modest improvements on measures of behavior such as absences and suspensions. (Contains 2 figures.)