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Is there really a gene that makes some people more violent than others? And should certain criminals get a lesser sentence because of what’s in their DNA? Dr Kat Arney investigates how the so-called “Warrior Gene” is being used as a defence to some grisly crimes, with the help of psychologist Dr Sally McSwiggan and Dr Jari Tiihonen. Presenter: Kat Arney Producer: Beth Sagar-Fenton Sound Mix: James Beard Editor: Penny Murphy