Some researches feel it is possible that what appears to be a genetic effect evidenced in twin research is actually the effect of sibling influence pertaining to criminality and referred to as the:

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The contagion effect refers to the influence of sibling relationships and shared environmental factors that could account for the apparent genetic effect observed in twin research on criminal behavior. This influence may be attributed to a range of factors, such as modeling of behavior, shared experiences that increase risk for criminality, and socialization within deviant peer groups.

Some Researches Feel It Is Possible That What Appears to Be