Who can help when my son is in prison for a crime he didn"t do?

For 14 months my son was in prison for forgery,during this time the courts said he was making meth.Not true, to my knowledge they don"t let people out to do this.I contacted the justice department and they gave the federal prosecutor all the evidence I sent them.Everyone involved in my sons case is guilty of at least official missconduct.What can a Dad do? I am poor,disabled,and so is his Mom.Will someone take his case? He will win millions in civil court.Mom has all evidence to prove never guilty.Will someone interested please help? We haven"t seen our son in years.