Jefferson Davis could have been convicted of treason upon “the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.”
History shows this was too high a standard for the prosecution to meet so the trumped-up charges against Davis were dropped.
And a good thing too. If Davis had been subjected to Victors' Justice, I don't think the South would have been so quick to forgive and forget the war crimes of Lincoln, Sherman, and others.
Yea - like they've done so well to get over losing.