In China, it has been alleged that executed prisoners have their organs removed and used for transplant purposes, with the mode of execution (a single bullet to the back of the head) being optimum for this purpose.
What if this was done in the US? It certainly seems efficient, even though many will find it unsettling.
(Note: I am NOT suggesting other features of the Chinese justice system, like a lack of due process and labor camps for dissidents, so don't even start)