Georgia's law that keeps secret the source of its execution drug is constitutional, the state's highest court ruled Monday, though two justices worried that confidentiality could lead to botched executions like the one in Oklahoma last month. In a 5-to-2 decision, the Georgia Supreme Court reversed a lower court ruling that granted a stay of execution to convicted killer Warren Lee Hill. The source of execution drugs has become contentious in the U.S. since major drug makers, many based in Europe, began refusing to sell their products if they were to be used in an execution. Like some other states, Georgia used a compounding pharmacy in July to get pentobarbital for Hill's planned execution.