田纳西州本周对克里斯塔·派克执行死刑失败，再次引发人们对致命注射药物供应链条不稳定且隐秘的审视。
Tennessee’s failed execution of Christa Pike this week has resulted in fresh scrutiny of the shaky and secretive supply chain for lethal injection drugs.
制药公司不再为执行死刑提供药物。因此，美国各州开始从监管宽松、甚至不受监管的渠道获取致命注射所用的药物组合。专家称，这让致命注射变得不再可靠。
Pharmaceutical companies no longer provide drugs for executions. So U.S. states have turned to loosely or even unregulated sources for the deadly cocktails, which experts say make lethal injections less reliable.