When a group of physicians gathered in Washington state for an annual meeting, one made a startling revelation: If you ever want to know when, how — and where — to kill someone, I can tell you, and you’ll get away with it. No problem. That’s because the expertise and availability of coroners, who determine cause of death in criminal and unexplained cases, vary widely across Washington, as they do in many other parts of the country. “A coroner doesn’t have to ever have taken a science class in their life,” said Nancy Belcher, chief executive officer of the King County Medical Society, the group…