When that guy didn't cooperate, Clarett was driving towards the guy's house, armed to the teeth (a rifle and 3 handguns).
He missed the exit, tried to make an illegal U-turn, and that's when the police nabbed him.
He had done a lot of other stuff that was sealed after he was no longer a juvenile. That, plus he had robbed a lot of people prior to that big arrest.
Surprisingly, he only served 5 years for the whole mess.
Even more surprisingly, he was genuinely penitent and cleaned up his act.