The US has the death penalty, all implementations of which have been demonstrated to qualify as cruel by most people's definitions (e.g. the chemical method is

The US has the death penalty, all implementations of which have been demonstrated to qualify as cruel by most people's definitions (e.g. the chemical method is not in any way based on science but rather pumping the victim full of overdoses of chemicals known to kill them, contrary to popular misconceptions it's not like being put down by a vet but more like suffocating until your brain shuts off). Given the state of the US prison industrial complex, I also wouldn't be surprised if the prisons El Salvador would provide for US citizens are at least up to par during the likely contractually required inspections. They wouldn't need to be as good as the average US prison, they would only need to be no worse than the worst US prison.