The Italian doctor and criminologist Cesare Lombroso (1835 - 1909) is the author of The Born Criminal Theory, which states that a person can be born predisposed to be a criminal because of their physical and biological characteristics. The natural delinquents, according to Lombroso, also present differences in their behavior, morality and capacity for socialization that distinguish them from normal people.
Some of the special characteristics that distinguish the born delinquent are the following: Irregular skull, flat forehead, pronounced lower jaw, large ears, long arms, greater strength on the left side of the body, acute sight, less sensitivity to pain and touch. On the other hand, the born delinquent lacks remorse, is not able to control his impulses and feels no shame. He is also predisposed to acquire vices such as tobacco, drugs or alcohol.
This theory has been strongly criticized but it has not yet been proven that it is incorrect, but quite the opposite, since it has been scientifically proven the existence of a "Murder Gene", also called "Warrior Gene", that creates in the individual a programmed predisposition to violent behavior.