[dragonwriter]

> Torture is against international law.

True.

> Even if you want to quibble about whether Geneva Conventions apply to "unlawful combatants" I think that even non-treaty customary international law would forbid torture.

More importantly, it would be against treaty-based international law even if you ignored the Geneva Conventions completely, since it is prohibited by the Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment.