The United States attempts to reduce the supply of illegal drugs by intercepting shipments and eradicating illegal crops. Despite these efforts, illegal drugs are still readily available, because growers, for example those in Colombia, move to different areas and plant smaller plots that are harder to find. So more effort should be made to reduce demand. This does not simply mean reducing the total number of people using illegal drugs. Because the important task is to cut consumption by heavy users, drug-dependent criminals in the country's jails should be treated for their addiction. In this way drug-related social problems can be reduced.