Genetic indicators for MK recruitment ?

https://geneticliteracyproject.org/2016/07/29/does-the-human-warrior-gene-make-violent-criminals-and-what-should-society-do/

The most recent appearance of MAOA-L is a paper Molecular Psychiatry published a week ago from a host of researchers based mostly in Finland. It showed that Finnish criminals convicted of several violent crimes frequently possessed either MAOA-L or a mutant version of another gene, CDH13, while the nonviolent controls did not. Find details in John Gever’s piece at MedPage Today.

CDH13 is involved in signaling between cells. Previous research has linked it with attention deficit/hyperactivity disorder (ADHD), autism, schizophrenia, substance abuse or bipolar disorder. So far as I know, this is the first time it has been associated with violent criminality. I will ignore it for the rest of this piece because I want to focus on MAOA and its long history of being connected with aggressive behavior. July 29, 2016

https://www.bbc.com/news/science-environment-29760212

Crime genes

The two genes associated with violent repeat offenders were the MAOA gene and a variant of cadherin 13 (CDH13)

The MAOA gene codes for the enzyme monoamine oxidase A, which is important for controlling the amount of dopamine and serotonin in the brain

CDH13 has previously been associated with substance abuse and ADHD

Those classified as non-violent offenders did not have this genetic profile

A deficiency of the enzyme this controls could result in "dopamine hyperactivity" especially when an individual drinks alcohol or takes drugs such as amphetamines, said Prof Tiihonen. The majority of all individuals who commit severe violent crime in Finland do so under the influence of alcohol or drugs.