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It's too bad the article doesn't provide more information and context. There are lots of studies that show people with gene x are more prone to y, but for a given individual the results are not a useful predictor of anything. Therefore it's a little troubling that people can be flagged as "potential violent gang member" based on their genetics.

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There are lots of studies that show people with gene x are more prone to y

Yes, and many of those studies aren't replicated when another data set is looked at. Gene association studies related to human behavior are thus far very subject to failure of replication.

http://norvig.com/experiment-design.html

Maybe some day there will be better studies with more reliable, replicable findings. Then there should be a way to tease out what environmental influences provide resiliency and protect against the effects of risky genes. Meanwhile, the first thing to do with this result is to see if it holds up in a different cohort of young people tested for gene associations to behavior.

Yeah it is a little shady, but still an interesting topic:

http://en.wikipedia.org/wiki/MAOA#Warrior_gene

http://en.wikipedia.org/wiki/Maori#Modern_socio-economic_iss...

http://www.nzma.org.nz/journal/120-1250/2441/

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