Researchers are exploring the potential link between certain substances and violent crime. A well-documented connection exists between alcohol consumption and violent behavior. Studies have shown that a significant portion of aggressive incidents and homicides involve individuals who have been drinking.

The exact percentage varies, but it is estimated to be between 30 and 50 percent. Further information on this topic, including a recent study published in a scientific journal, is available from El País. The study may shed more light on the relationship between substances and violent behavior, but details are not provided here.