A master thesis at the faculty of Science at the University of Basrah ( Relationship between COMT and MAOA genes polymorphisms with aggressive behaviour ) and showed the researcher`s thesis (Dheyaa Noori Salman, Supervised by Prof. Dr. Adnan I ssa Al-Badran) This genetic polymorphism has an influence on the development of aggressive behavior. The study recommended using a larger sample size and investigating into additional genes. It also suggested that it was necessary to look into how these genes affected the police and army.