Illegal rugs are related to crime in multiple ways. Most directly, it is a crime to use, possess, manufacture, or distribute drugs classified as having a potential for abuse (such as cocaine, heroin, morphine and amphetamines). Drugs are also related to crime through the effects they have on the user's behavior and by generating violence and other illegal activity in connection with drug trafficking. The statistics on this page summarize the various ways that drugs and crime are related in the United States. Links for other countries are provided below.