With due respect, in the Christopher Lee case (Erin Corwin), he was never named as a suspect until he was charged with murder. They even let him leave the state. I don't think that being named a suspect equates to charges and being named just a POI means that they won't be a suspect ... I think it is a chess game that police play.
What I am saying is there is no tried and true rule it could go either way. I think that his evasion from the police speaks volumes. While he may not have anything to do with Hannah's disappearance, he is guilty as mud about something... that, I am sure of. Why else would he run away even when there are warrants out for his arrest.You can bet it is not just traffic violations.