Critical of earlier historians who tended to treat Garibaldi with condescension, Ms Riall is anxious to display him as the resourceful manipulator of his own legend.
Moreover, even when it does so, there are knotty problems of obtrusiveness and privacy to be resolved before one could perform brain scans outside the laboratory.
"Common sense, common feeling, common reason" tells us that any law cannot compel people to do what they cannot do, otherwise the law will be destroyed.