In which of the following categories would you consider yourself: a lifelong criminal, someone with bad behavior but grew out of it, or a non-criminal? Because According to Dr. Terrie Moffitt's Theory, people fall into one of these three different types. I read two articles both discussing J.C. Barne's research on the effect of genes on criminal behavior. The paper's conclusion was that lifelong criminals are influenced by genes more than the environment. For non-criminals, the environment was the greatest influence and for people who grew out of their bad behavior it was equal between environment and genetics. I have a few reactions to these articles. It was written that a strong link between genes and criminality was found from a study of 4,000 people. However, it does not include anything about how the study was conducted. I am curious to know how they found this "strong link". How do I know that the 4,000 people were the best sample for the world's population? Written in the dailyRx article, "Barnes explains that there is no gene that actually causes someone to commit a crime, and that crime is a learned behavior. However, he cautions '...there are likely to be hundreds, if not thousands, of genes that will incrementally increase your likelihood of being involved in a crime even if it only ratchets that probability by 1 percent...It still is a genetic effect. And it's still important.'" This paragraph raises question marks every time I read it. Could it be that the genes present in the wrong environment create criminals? I think it is important to make clear that they are saying there are no "crime" genes but genes that can influence actions that are criminal. I feel that this could easily be misconstrued.