A man kept shackled to his hospital bed after he suffered serious injuries in Cook County Jail has received the go-ahead to pursue a due process claim. In a written opinion, U.S. District Judge Manish S. Shah acknowledged that Sheriff Thomas J. Dart’s shackling policy is based on the “legitimate non-punitive government purpose” of preventing escapes. But there is a question whether shackling detainee Dwight Moore was excessive and, therefore, unconstitutional, Shah wrote. Moore, he wrote, was …