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gratuitous, self-referential post
http://tofubo.blogspot.com/2006/10/republic-is-dead-long-live-republic.html
...the Constitution prohibits writs of attainders and the Geneva Conventions prohibits absolving people who commit war crimes. (Convention IV, Part IV, Section 1, Subsection III, Art. 148.) “No High Contracting Party shall be allowed to absolve itself or any other High Contracting Party of any liability incurred by itself or by another High Contracting Party in respect of breaches referred to in the preceding Article”...
http://fletcher.tufts.edu/multi/texts/BH241.txt (do a search for "Art. 148")
the preceding article (147) stipulates the things you can not do