Are the circumstances of the conviction ever reason for reversing a divorce granted on grounds of incarceration?
No. Even if the spouse was wrongfully convicted by a biased jury and prejudiced judge, it does not matter. The cause of the divorce — imprisonment — happened. The divorce and the incarceration, from a legal standpoint, are related (the same individual is a party in both) but separate actions. Even though the first was wrongful, the second was legitimate. Under these circumstances the best this couple could do would be to remarry.
