dont let it deter you....
if and when hiring booms again, companies have to be less picky.
keep improving your resume so that you show you have gotten over the incident, learned from it, and moved on succesfully.
as others said, just dont ever think its "expunged". NOTHING can be 100% expunged...not driving records,faa records, nothing.
A good background check can and will tell all, and you dont want to be confronted with a lie...because then you are DONE.