"issuing preemptive pardons to government torturers would be an unambiguous and blatant violation of our obligations under the Convention [Against Torture]." -
excerpted from Do we still pretend that we abide by treaties?Â
by Glenn Greenwald, Salon, February 15 2009
UPDATE:  Citing numerous leading international law authorities, Valtin has an excellent discussion of the obligations the U.S. has to criminally investigate Bush crimes, not only under the Convention Against Torture but also under the Geneva Conventions.   If we don't consider ourselves bound by the treaties we sign, we should just say so and abrogate them. Those demanding criminal immunity for Bush officials are advocating that we can and should violate our treaty obligations; they really ought to be honest about it.
