President Obama and any President has the power to issue secret pardons.   There is nothing in the constitution that says the pardons must be public.   I suspect that Hussein pardoned everybody for everything, including himself.  This applies to torture and murder of children.   The only thing that can't be pardoned is treason.  Oh, and you cannot pardon future crimes.   Any crimes done after the date of the pardon are punishable.    This I believe is one reason why everything must go so slowly.   Evidence of crimes already pardoned are useless unless it is treason.