Samples of data sources for measuring this outcome:
Juvenile crime decreases

Data source

Bureau of Justice Statistics - Arrests by age
National level resources - Click on "Annual Tables". Select year of interest and "Offense by Age".
Easy Access to State and County Juvenile Court Case Counts
State level resources - Select state of interest in drop down menu.
County level resources - Scroll down to county of interest.
Kids Count Data Center - youth residing in juvenile detention, correctional and/or residential facilities
National level resources - Select "Safety and Risky Behaviors Indicators." Select "Juvenile Justice."
State level resources - Click state from map. Select "Safety and Risky Behaviors Indicators." Select "Juvenile Justice."
County level resources - Click state from map. Under location, select "By county." Select "Safety and Risky Behaviors Indicators." Select "Juvenile Justice." (NOTE: If not found, data is not available for this item at the county level in the state of interest).