This is very good news, as reported by The Crime Report, and can be partially attributed to the broken windows policing and three strikes sentencing being used by most jurisdictions in the United States over the past few decades.

An excerpt.

The rate of violent youth crime arrests plummeted nearly 40 percent between 2009 and 2012, according to new national estimates calculated by John Jay College of Criminal Justice professor Jeffrey Butts.

The estimates are based on sample-specific arrest figures released annually by the Federal Bureau of Investigation.

In 2008, there were approximately 300 violent youth crime arrests for every 100,000 juveniles nationwide, but that figure has declined each year since. There were fewer than 190 arrests per 100,000 juveniles in 2012, according to the report.

Full report.