This has such potential. The idea of lawmen abusing the item, a society that is entirely accepting of the dead wandering around, moral issues of whether this is inhumane since their free will is stripped. And my personal favorite:
*cleric walks into a town full of zombies*
"AAAAHHH!" *Greater Turn Undead*
"Noooo! without those laborers we're going to starve this winter! You fool you've killed us all!"