It is an issue of jurisdiction. The prisoners at G were prisoners of war not civil prisoners incarcerated under Texas Criminal Codes. Prison justice in Texas is governed by state law and sometimes federal law. The grievance procedure is different in state prison and often has to be p/u by federal court to make the claim of cruel and unusual punishment under the federal constitution. State standards are different than G but much of the litigation over conditions at G was about "torture" not dehumanizing living spaces. I think u r talking about this ironic situation in a political sense and not so much from a legal perspective. Good luck to ur boyfriend in Bexar County.
I disagree with my colleague's answer. Prison overcrowding may not be the same as torture but it does constitute cruel and unusual punishment that has caused many prisons here in CA to be taken over and administered by federal trustees. G did not imprison POW's as most of these people were not seized in the Iraq war but in Bush's war on terrorism which is not really a war at all but an excuse for tyranny. Prison overcrowding is something you should fight as unconstitutional in the country I live in.
In fact, the US prison system in many places may be in violation of international law. However, international standards are generally not admissable in US courts. Most of the civilized world including almost all of Europe including Russia has given up the death penalty too but the US along with China, Saudi Arabia and Iran are big proponents of it.