Texas’ prison system doesn’t have to reveal where it gets its execution drugs, the state attorney general said Thursday, marking a reversal by the state’s top prosecutor on an issue being challenged in several death penalty states. Attorney General Greg Abbott, the Republican nominee for governor in the nation’s busiest death penalty state, had rebuffed three similar attempts by the Texas Department of Criminal Justice since 2010. His decision can be appealed to the courts. […] The issue has put Abbott in a thorny position during an election year in Texas, where the death penalty is like gun rights: Candidates...