Botched executions came after changes to state protocol
Christa Pike's failed execution in September has raised fresh questions about Tennessee's lethal injection execution protocol, which is in its fourth iteration in the past two decades.
Pike's was the second botched execution by Tennessee this year. She had been sentenced to death for her role in the 1995 torture and murder of her 19-year-old classmate, Colleen Slemmer.
CBS News reviewed the state's lethal injection protocols going back to 2007 and found that over the years the protocols grew increasingly vague.
Read the original report
Opens CBS News in a new tab