An attorney for several death row inmates in Kentucky wants to stop the state from using a recently-acquired stock of a lethal injection drug.There is a national shortage of sodium thiopental, which is one of the drugs used in executions. The commonwealth recently purchased enough of the drug from a company in Georgia to perform three lethal injections.Public defender David Barron has asked a judge to block any executions that use the doses purchased from Georgia. He says the purchase violates previous court orders.