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But this study is hardly the last word on the genetic roots of violence. There are almost certainly other genes involved and other kinds of life stress that can contribute to violence. Moffitt and her colleagues are already planning more experiments to isolate other factors that might be involved. As for predicting whether a particular child will become violent, no one can be sure when that might be possible. For now, we will have to deal with kids like the King brothers the way we always have: one case at a time. --By Michael D. Lemonick. Reported by Alice Park/New York