A 2010 study showed that over 50% of homicide offenders were under the influence of drugs or alcohol. In over 25% of the cases, more than one substance was detected. Almost 40% of offenders were under the influence of alcohol, and the most common drugs used when committing homicides were cannabis and opiates.
More facts on homicides:
The country with the highest per capita murder rate is Colombia, followed closely by South Africa. The country with the lowest per capita murder rate is Qatar.
In 2006, homicide was the second leading cause of infant mortality in the US.
In the 2000s, the leading cause of workplace deaths in restaurants and hotels was homicide, with 80% of deaths resulting from homicides.