I believe there are different sealing/expungement laws in each county of each state, so that's hard to say, but I do know in some jurisdictions, violent crimes are not wiped off the record once an offender turns 18. Petty theft, vandalism, things like that are certain to disappear once the defendant reaches the age of majority. This may be different, and honestly I hope it is - this little fucker needs to be taught a lesson.