When administered as their manufacturers intend, the three drugs Arkansas could use in lethal injections next week — if courts allow the executions to proceed — are key products of the pharmaceutical industry. They produce amnesia for patients heading into medical procedures, relax muscles to the point that they don’t interfere with knife-wielding surgeons and regulate heart rhythms in cardiac patients. A state judge ruled Friday that Arkansas cannot inject inmates with the muscle relaxant currently on hand until he addresses a complaint that prison officials obtained the drug improperly. He set a hearing for Tuesday; the executions were due...