In a report released Thursday, the Justice Department's National Drug Intelligence Center (NDIC) said that overall, the availability of illegal drugs is increasing and that "the overall threat posed by illicit drugs will not diminish in the near term." The announcement comes after more than four decades of harsh state and federal policies designed to curb the supply of illicit drugs.

The report, the National Drug Threat Assessment 2010, also once again identified Mexico's so-called drug cartels as the "single greatest drug trafficking threat to the United States." It blamed the cartels, or DTOs (drug trafficking organizations), as it more accurately but less catchily refers to them, for much of the increase in illegal drug availability.

The NDIC noted that the prevalence of four out of five of the major drugs of concern -- heroin, marijuana, MDMA (ecstasy), and methamphetamine -- was "widespread and increasing in some areas." Only cocaine availability was down, with NDIC reporting persistent shortages.

Heroin availability was up, and NDIC said that was "partly attributable to increased production in Mexico," where opium production more than doubled between 2007 and 2008. Meth availability was up "as the result of higher production in Mexico," and "sustained" US domestic production. Also, "marijuana production increased in Mexico." Only with MDMA did NDIC point the finger at anyone else -- in this case, Asian DTOs who produce it in Canada.

"Mexican DTOs, already the predominant wholesale suppliers of illicit drugs in the United States, are gaining even greater strength in eastern drug markets where Colombian DTO strength is diminishing," NDIC said as it pronounced them the greatest drug trafficking threat. It included the following bullet points making the case:

• Mexican DTOs were the only DTOs operating in every region of the country.
• Mexican DTOs increased their cooperation with US-based street and prison gangs to distribute drugs. In many areas, these gangs were using their alliances with Mexican DTOs to facilitate an expansion of their midlevel and retail drug distribution operations into more rural and suburban areas.
• In 2009, midlevel and retail drug distribution in the United States was dominated by more than 900,000 criminally active gang members representing approximately 20,000 street gangs in more than 2,500 cities.
• Mexican DTOs increased the flow of severaldrugs (heroin, methamphetamine, and marijuana) into the United States, primarily because they increased production of those drugs in Mexico.
• Drugs smuggled into the United States by Mexican DTOs usually are transported in private or commercial vehicles; however, Mexican DTOs also use cross-border tunnels, subterranean passageways, and low-flying small or ultra-light aircraft to move drugs from Mexico into the United States.
• Mexican DTOs smuggled bulk cash drug proceeds totaling tens of billions of dollars from the United States through the Southwest Border and into Mexico. Much of the bulk cash (millions each week) was consolidated by the DTOs in several key areas, including Atlanta, Chicago, Los Angeles, New York City, and North Carolina, where it was prepared for transport to the US-Mexico border and then smuggled into Mexico.
• According to the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), Mexican DTO members or associates acquire thousands of weapons each year in Arizona, California, and Texas and smuggle them across the border to Mexico.

The report came as a senior US delegation led by Secretary of State Hillary Clinton returns from Mexico City, where it spent two days in talks with Mexican officials about increasing cooperation in their joint struggle against the drug traffic.