Mental trials: Conjoined twins

How would legal systems deal with conjoined twins, should only one of the pair be engaged in illegal activities? Interest in the question accelerated with the death in 1874 of the celebrity twins Chang and Eng. In London, The Law Times (volume 56‎, published on Feb 21) was one of many forums for the discussion. In America, Mark Twain, a non-lawyer, had already given the notion a twist.

Nick Cam, an American law student, takes up the question anew in a blog called Half Guilty, possibly to be followed by a book, asking: “How would the American legal system punish conjoined twins if one committed a murder while the other was completely innocent?”

Presumably legal results would be different, if no less theoretical, in different countries.