clean bill of health, to have a/be given a

To have passed a rigorous inspection. The term comes from the nineteenth-century practice of issuing an actual bill of health, a document signed by the authorities and given to the ship’s master, stating that no infectious diseases existed in the port of embarkation. If there was some kind of epidemic, the ship received a foul bill of health. Before long the term was transferred to the assurance that an indi- vidual or group or organization was found, after investigation, to be morally sound.