We study the impact on long and short run criminal behavior from a large scale Swedish reform of vocational upper secondary education, extending programs and adding more general theoretical content. The reform directly concerns age groups where criminal activity is high and individuals who are overrepresented among criminal offenders. Using detailed administrative data we show that the reform led to a reduction in property crime, but no significant decrease in violent crime. The effect is mainly concentrated to the third year after enrollment, which suggests that being in school reduces the opportunities and/or inclinations to commit crime.