My question involves criminal law for the state of: Michigan
I have a friend that is currently in prison. The original sentence was in 2004 for 2 to 7 years. He went up for parole and was granted parole. Two weeks later he received notice that his parole had been "taken back" because of information received regarding an investigation. On the report it says that parole is being taken back because he is under investigation for a crime in 2004.
If my friend is in prison, how can him being under investigation affect his parole...he hasn't been charged with anything in 4 years? How long can this investigation continue? Is there anything that can be done?

