 More information is at waltonfamilyfoundation.org. This is NPR. It's Morning Edition from NPR News. I'm Sasha Pfeiffer. And I'm Steve Inskeep. Texas has executed more people than any other state over the past five years using a sedative called pentobarbital. How officials obtained that drug has been secret up to now. The state passed a law saying it does not have to disclose the source.