The Associated Press, January 28, 2011 by Andrew Welsh-Huggins, Greg Bluestein, and Thomas Watkins
http://abcnews.go.com/US/wireStory?id=12787597
“You can’t just switch pentobarbital for sodium thiopental and proceed as if nothing has changed,” said Ty Alper, the associate director of the death penalty clinic at the University of California-Berkeley. “There’s likely to be litigation and courts will have to satisfy themselves that it will result in a humane execution.”