^In the US he might not have been "prosecuted" per se.
But juvenile laws vary widely by state. And in many cases, juvenile judges have broad discretionary leeway in dealing with so-called "delinquency" issues even in the absence of a criminal conviction. A kid could be removed from his home and sent to a youth detention facility in many places merely on the say-so of a judge.
And in some places, the US or state governments have laws in place to prosecute minors under adult laws for certain offenses.
I think he got far less of a slap living where he does than he might have gotten here for messing with a police agency.