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In America 31 states retain the death penalty and Arkansas is one of them. In 2017 the state executed four men ahead of the expiry of a batch of lethal injection drugs. Now, with another batch due to expire, inmates on death row fear another 'mass execution'.

The lethal injection is made up of three different chemicals, and this animation explains how they combine to deliver a fatal dose. But are critics right? Does this type of lethal injection mean convicts could have a slow and painful death?