Is there anything at all that can be done to expunge more than one misdemeanor from my son's record in Michigan?

Depending on his age at the time and the actual charge that he pled guilty to, it may be possible. Michigan just changed its expungement law for this very instance. Please describe his convictions and his age at the time and I can better respond to this question. According to the new change in the law: Individuals may have up to two minor offenses on their record in addition to the offense for which they are applying to have removed. A minor offense is considered a "misdemeanor or ordinance violation for which the maximum permissible imprisonment does not exceed 90 days, for which the maximum permissible fine does not exceed $1,000.00, and that is committed by a person who is not more than 21 years of age."

Your son can have as many as three convictions an still be able to get one of them expunged. The other two convictions would have to have maximum penalties of no more than 90 days and they must have been committed prior to his 21st birthday.