In this article I've linked, this researcher has found evidence in other studies that has come to show that, usually, genetic factors don't play a key role in criminal behavior. There is a sentence in the article that reads, "[t]hey concluded therefore that in respect to common crime, hereditary factors are of little significance." However, it should be noted that reading a little farther into the researcher's paper, she concludes that although genetic factors may not play a major role in criminal behavior, those factors are more likely to influence property offenses.
So for myself, I find this debate quite interesting. One experiment that this paper I linked never covered and I'm sure this has been done before, but what would happen if researchers observed and measured the criminal behaviors of identical twins that were raised in different homes--say they were adopted by two different families? Maybe one of the adoptive families has a more "criminal-inclined" environment, where the other family has hardly any criminal history or "criminally-inclined" environment. This would give researchers any even more solid way of deciphering the nature/nurture effect because these adopted children have the same genotype, but different environments.
I continually find myself wondering how else we can tweak our research experiments to better understand this interesting idea. I find nature vs nurture a very fascinating topic!