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you are correct in that he needs to get a governor's pardon and then file for an expugement - sending a letter of request for the application to the Maryland Parole Commission is the first step - it does not matter if he was never on parole, they are the first review in these matters
this is from the MPC's website and you may read more at this link under Pardons
The guidelines regarding who may apply for a pardon are as follows:
if you mailed your letter to the governor, it was probably forwarded to the MPC - you can call and check to see if they have gottent the request for the application.