MP3, 9m42s, 2.2MB, first broadcast 2 May 2014
A new combination of drugs used to administer the death penalty was used in Oklahoma on Tuesday.
The injection was botched, leaving the inmate writhing in pain, then dying of a massive heart attack 43 minutes later.
Part of the reason new drugs were used in this instance is the struggle to source drugs for lethal injections. The EU has banned one of the most common sedatives in lethal injections, leading some states to try out new combinations of drugs.
Anna Bracewell-Worrall speaks to Professor Corinna Lain, Associate Dean of Faculty Development at the University of Richmond in Virginia about the about drugs used for lethal injections.