https://www.sciencedirect.com/science/article/pii/S037907382030373X

http://uswest.ensembl.org/Homo_sapiens/Variation/Population?db=core;r=3:114171468-114172468;v=rs6280;vdb=variation;vf=2247

Here the candidate gene for A trait shows linkage of violent behavior and cocaine abuse with the non A variant. This is from a Brazilian study, a area of corybantic habitancy. So this may be confounding of a subgroup of the population there that is marginalized and perhaps more N type?? vs a true tendancy for cocaine abuse and violence with N trait.