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In most states a driver can challenge a drivers license suspension by court or administrative hearing. It sounds like that is what he has coming up. In nearly all jurisdictions, a lack of actual knowledge of a suspension is a legitimate defense. When I handle these cases (in CA only) that is my favorite issue. Not sure if it applies. My tip would be to hire a defense attorney to represent him at the hearing. Try to win.
It does not matter whether or not the officer noticed the drivers license was suspended. The officer may have actually been "missing" that fact to give him a break and to avoid impounding another car and arresting another person.