A weakness of the genetic and neural approach?

-Methodological issues with twin studies used to support the genetic explanation of offending -Lange's study into twins and criminality had one major flaw - he didn't know if the twins he was studing were identical, he guessed! -Twin studies are unable to serpate genetics from environement as they are often brought up together in the same family and school envrionment -Lowers internal validity, hard to establish cause and effect relationship with genetics and criminality due to confounding variables