A related story found today on cnn.com.
Convicted killer fears his last moments
The study concluded the drug protocol a "failure" because the prisoners had below acceptable levels of thiopental in their systems indicating they probably suffered immense pain before they died.
"I was shocked that there had been no research on what is being used on humans, when in veterinary medicine, pancuronium is strongly discouraged," said study author Dr. Teresa Zimmers, an assistant professor of surgery at the University of Miami School of Medicine.
Tennessee's rescinded manual appeared to confuse lethal injection with electrocution. For example, it called for an inmate's head to be shaved, and for officials to have a fire extinguisher, electrode gel, an emergency generator and an electrician present.
And, for those interested, copies of the rescinded manual and the new, revised procedures:
Old manual
Newly proposed procedures