From the Los Angeles Times:

Interruptions of the flow of cocaine to the United States are causing street prices to rise, a sign that the “war on drugs” is working, the White House anti-drug chief said here Thursday.

John P. Walters, director of the Office of National Drug Control Policy, told reporters that interdictions in Colombia, in other countries along cocaine transit routes and on the open seas were reducing drug supplies, according to data on price and purity gathered in 37 major U.S. cities.

As a result of reduced supply, street cocaine prices over the first nine months of the year rose to an average $136.93 per pure gram at the end of September, a 44% increase from January, he said. Price and purity data were supported by other measures, including reduced evidence of cocaine use as found in workplace tests, he said.

Price bumps in U.S. street cocaine prices have occurred before, touted by U.S. law enforcement officials each time as evidence that counter-narcotics policies were working. But the increases often proved temporary and were followed by supply adjustments by drug dealers and a settling back of cocaine prices.

Others however, disagree with that assessment.

Critics who acknowledge that more cocaine is being seized point out that data on Colombian coca cultivation do not conclusively show that production is down.

Others, such as Bill Piper, director of national affairs for the Drug Policy Alliance, a New York-based organization advocating alternatives to the administration’s drug policy, said higher prices inevitably cause dealers to boost supply.

“Assuming that high cocaine prices are hurting cartels is like assuming high gasoline prices are hurting oil companies,” Piper said.

Others say the decreased supply may just reflect the fact that more Colombian cocaine is being shipped to Europe, where it can fetch even higher prices.

The Global Drug Trade is valued at $321.6 Billion.