Execution by firing squads is allowable in Utah but also in Oklahoma and Idaho.
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Well, yes and no...
http://en.wikipedia.org/wiki/Execution_by_firing_squad#Firing_squads_in_the_United_States
On April 1, 2009,[28] a bill to eliminate firing squad as a method of execution in Idaho was enacted, and took effect July 1, 2009. As of 2010, Oklahoma is the only other state in which execution by firing squad is legally available, though as a backup method only, in case both lethal injection — the state’s primary method of execution — and electrocution are regarded unconstitutional. [27]