A look at pentobarbital reveals why the barbiturate used in Christa Gail Pike's failed lethal injection may not have reached fatal concentrations.
https://www.foxnews.com/health/what-know-pentobarbital-death-row-inmate-survives-2-lethal-injection-doses
https://www.foxnews.com/health/what-know-pentobarbital-death-row-inmate-survives-2-lethal-injection-doses