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Amendment XXVIII
The power of pardon, in Article 2 Section 2, is limited to the pardon for Offenses against the United States that have led to conviction as a result of a speedy and public trial (described in Amendment 6).
Implication: you cannot get in the way of the justice system, and you cannot use a pardon to stop the truth from getting out. There are pardons that stain the transition from one president to another, such as Ford's pardon of Nixon, Bush's pardon of Casper Weinberger, and the eventual pardon of Scooter Libby by Dubya.