I will just add that it is actually quite common to have arrangements that get into a bit more detail than you could do in a treaty. We have them, for example, in the transfer of offenders. We have a treaty--the transfer of offenders treaties, the treaty between governments--but then we have administrative arrangements that lay out more specific details. It's really quite common to have an arrangement that gets into more detail than you do in the actual treaty. In this case, the actual treaties are Geneva conventions and all the human rights conventions that Afghanistan is a party to and we are a party to. So you wouldn't want to rewrite them.
On December 11th, 2006. See this statement in context.