Monoamine oxidase (MAO-A) is an enzyme found in the nervous system and plays an important role in the breakdown of monoamine neurotransmitters. This enzyme varies among individuals depending on genetic factors. The monoamine oxidase-A (MAO-A) gene has been studied by various researchers to understand behavioral differences between individuals and evaluate crime propensity. However, serious ethical and legal problems may arise regarding the use of genetic factors alone in the judicial process. In this context, considering environmental factors as well as the MAO-A gene may contribute to the development of a more comprehensive approach. The role of the MAO-A gene in the judgment process has created an area of research that allows us to understand behavioral differences. The MAO-A gene has been associated with various behavioral traits. It has particular effects on aggressive behavior, antisocial behavior, and emotional reactions. In this context, the MAO-A gene may be an important factor in determining how individuals respond to environmental factors and guide their judgment processes. Some studies show that individuals with low MAO-A activity may be prone to antisocial behavior and crime. Thus, the MAO-A gene can be taken into consideration in determining guilt in legal processes. Assessing individuals' criminal propensity based on genetic factors can make the justice system more effective and fair. For example, harsh childhood conditions or traumatic experiences can trigger genetic predispositions and increase criminal propensity. In this case, it is important to take environmental factors into account when evaluating the genetic profile of the individual during the judicial process. Many ethical and legal issues need to be carefully considered on how to integrate the MAO-A gene into the judicial system. Therefore, research on the usability of the MAO-A gene in the judicial process should be continued.
Key words: Monoamine oxidase, forensic genetic, case study, heredity and crime, serial killer
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