Well I'm not sure that it was automatically expunged and I certainly don't count on it. But I have no idea how to begin looking for my old criminal record. So far I haven't declared it on any applications, which has me worried. In some cases they say 'have you committed any offenses in the last 10 years', which means I can truthfully say no. But some just say 'have you committed any offenses, period', and that has me worried.
I'm not going for the FBI, just space industry jobs, but they want to make sure that they don't hire any secret Chinese spies or whatever. Not sure how a misdemeanor from a decade ago while I was a minor was any of their business, but I don't want to screw myself.