Well, we kind of already can. For example there is a gene associated with alcoholism. Somebody with that gene is probably significantly more likely to drink and drive than somebody without it. The ability to predict the actions of people with their DNA is just getting better and better actually. http://www.webmd.com/mental-health/news/20040526/researchers-identify-alcoholism-gene In fact there is also a gene associated with binge drinking http://www.cbsnews.com/8301-204_162-57557041/gene-variation-may-make-a-person-more-likely-to-binge-drink/ and a gene associated with rape and murder: http://www.deccanchronicle.com/121221/news-current-affairs/article/genes-responsible-rape-study