By Gary S. Becker and Kevin M. Murphy | The Wall Street Journal

Starting with the fourth paragraph:

The total number of persons incarcerated in state and federal prisons in the U.S. has grown from 330,000 in 1980 to about 1.6 million today. Much of the increase in this population is directly due to the war on drugs and the severe punishment for persons convicted of drug trafficking. About 50% of the inmates in federal prisons and 20% of those in state prisons have been convicted of either selling or using drugs. The many minor drug traffickers and drug users who spend time in jail find fewer opportunities for legal employment after they get out of prison, and they develop better skills at criminal activities.

Prices of illegal drugs are pushed up whenever many drug traffickers are caught and punished harshly. The higher prices they get for drugs help compensate traffickers for the risks of being apprehended. Higher prices can discourage the demand for drugs, but they also enable some traffickers to make a lot of money if they avoid being caught, if they operate on a large enough scale, and if they can reduce competition from other traffickers. This explains why large-scale drug gangs and cartels are so profitable in the U.S., Mexico, Colombia, Brazil and other countries.

The paradox of the war on drugs is that the harder governments push the fight, the higher drug prices become to compensate for the greater risks. That leads to larger profits for traffickers who avoid being punished. This is why larger drug gangs often benefit from a tougher war on drugs, especially if the war mainly targets small-fry dealers and not the major drug gangs. Moreover, to the extent that a more aggressive war on drugs leads dealers to respond with higher levels of violence and corruption, an increase in enforcement can exacerbate the costs imposed on society.

The large profits for drug dealers who avoid being caught and punished encourage them to try to bribe and intimidate police, politicians, the military and anyone else involved in the war against drugs. If police and officials resist bribes and try to enforce antidrug laws, they are threatened with violence and often begin to fear for their lives and those of their families.

Read on at The Wall Street Journal