States can still use the sedative drug midazolam in lethal injections, according to today's Supreme Court decision. But how exactly does the drug work, and why do some say that it's unreliable?In a 5-to-4 vote, the court ruled that using midazolam does not violate the Eighth Amendment, which prohibits "cruel and unusual punishment." In executions, the drug has been used to induce unconsciousness before other drugs are administered to stop an inmate's breathing and stop the heart.However, midazolam was involved in several botched executions last year, including the case of Clayton Lockett from Oklahoma, who lived for about 45 minutes...