I've looked around online for this answer for awhile, and even contacted my uncle who is a lawyer (who didn't know the answer, or wanted to get paid); but I was stopped, arrested for simple drug possession (finger printed and told i was under arrest), and let go at a federal check point (not a border crossing but about 3 hours away from one) with no court dates or charges. They never filed charges. Since they got my finger prints, I know that if someone needed my fingerprints (lets say the people who decide if you can practice law or not), they would be able to get records from this incident (or arrest if you may). I wanted to know if expunging a federal arrest that resulted in absolutely nothing was plausible/possible.