According to this article :
http://www.theatlantic.com/politics/archive/2015/03/gas-chambers-electric-chairs-and-firing-squads/387706/ , it appears that perhaps European countries play a hand in causing some States here to return to more archaic forms of execution by not supplying certain drugs that were, previously, used in concocting the fatal doses administered to condemned criminals.
Also seems that Triple T's wish for sudden death at the end of a .30 caliber missile travelling at 3,300 feet per second could be in the offing if the State of Utah so chooses.
Ironically for many decades Utah offered the condemned their choice of execution, including firing squad. This was based on the fact that the LDS (Mormon) adherents believed that they could not gain forgiveness and therefore admission to heaven unless they shed their own blood if they had been convicted of murdering someone by a method that caused their victim to have shed their own blood...