A federal judge has barred the importation of a drug used in executions of death row prisoners. On Tuesday, Judge Richard Leon of the Federal District Court in Washington ruled the Federal Drug Administration had unlawfully allowed sodium thiopental into the United States. The case was brought on behalf of death row prisoners in Arizona, California and Tennessee. In his ruling, Judge Leon chided the FDA for what he called “a callous indifference to the health consequences of those imminently facing the executioner’s needle.”