After a record has been esponged does any law enforcement agencies have any access to your record such as through back ground check?

If your record has been expunged legally, then past offences shouldn't exist for other law enforcement folks to tap into. You shouldn't be on file for anyone to check up on. If you were arrested after your record was legally expunged, then your previous crimes would have no bearing on any later offences. You are now what they call a "clean skin" and any future court should see you in that light. If your record has been expunged... you need to live a fresh new life to get the benefit of the second chance you have been given.