That raises an interesting question.
Are juvenile records completely expunged at age 18?
When a gun shop runs your criminal background check, does everything pre-18 come up blank?
The problem is between the Broward County school boardl and the Broward County Sheriff, they didn't WANT to arrest any teens and risk giving them a felony record, because they they couldn't vote (D).
Here is the Broward County Sheriff bragging about how he doesn't arrest teen law breakers:
youtu.be/b1gcYmzywvg?t=3m29s