The Italian psychiatrist Lombroso was first to propose in 1876 an empirical biological theory of criminal behavior [21]. According to this theory, some people are born rather than become criminals, and manifest different characteristic ‘‘atavistic’’ physical traits, such as their cranial structure, nose size, jaw jutting, jug ears, skin wrinkles, tattoos, that result from a regression to a more primitive state of evolution, which may facilitate their identification. For Lombroso, only one third of the criminal population belongs to this group of people, while other ‘‘criminaloids’’, with just some of the atavistic traits of criminality, may be influenced by an adverse environment [21].