Missouri switched to a one-drug execution method late last year. The state obtains the drug, pentobarbital, from a compounding pharmacy that it refuses to name.
Ferguson's attorney, Jennifer Herndon, had argued that the state's secretive process prohibited the public from knowing exactly how the drug was made and whether it could cause pain and suffering for the inmate.
The same drug was used in the state's four previous lethal injections this year. Like Ferguson, those inmates also showed no outward signs of distress during the execution process.
Missouri executed just two men between 2005 and November. But after the state switched from a three-drug execution method to a single-drug protocol last year, executions resumed. Although critics have raised concerns about the drug and the secretive ways Missouri obtains and uses it to kill inmates, more executions are likely.For my ebook on the history of the death penalty in the USA, up to the current day, go here.