China disputes US claims it is top source of deadly synthetic opioids
US claims that China is the top source of synthetic opioids which have killed thousands of drug users in the US and Canada are unsubstantiated, Chinese officials have said.
Both the US Drug Enforcement Administration (DEA) and the White House Office of National Drug Control Policy have pointed to China as North America's main source of fentanyl, as well as related drugs and the chemicals used to make them.
Such statements "lack the support of sufficient numbers of actual, confirmed cases," China's National Narcotics Control Commission told the DEA's Beijing office.
In a letter, which the commission also sent to reporters, Chinese officials urged the US to provide more evidence about China's role as a source country.
DEA officials said their casework and investigations consistently lead back to China. DEA data also shows that when China regulates synthetic drugs, US seizures plunge.
Russell Baer, a DEA special agent in Washington, said: "China is not the only source of the problem, but they are the dominant source for fentanyls along with precursor chemicals and pill presses that are being exported from China to the US, Canada and Mexico."
Beijing is so concerned about international perceptions of China's role in the opioid trade that after reports highlighting the easy availability of fentanyls online from Chinese suppliers, the narcotics commission made a rare invitation to a team of journalists to discuss the issue at the powerful Ministry of Public Security, just off Tiananmen Square.
US-Chinese cooperation is essential for mounting an effective global response to an epidemic of opioid abuse which has killed more than 300,000 Americans since 2000.
The presence of fentanyl, a prescription painkiller up to 50 times stronger than heroin, and related compounds in the US drug supply began to rise in 2013, after dealers learned they could multiply profits by cutting the potent chemicals into heroin, cocaine and counterfeit prescription pills.
Even as US Congress considers legislation to punish opioid source countries, no government agency has produced comprehensive data on seizures of fentanyl-related substances by country of origin.
The national database on drug seizures overseen by the DEA does not require reporting by source country and may not accurately reflect seizures of all fentanyl-related compounds.
Mr Baer said it did not even have a "fentanyl" category until around two years ago. It also takes time for chemists to identify seized drugs, which means fentanyl-related samples may be incorrectly logged as other drugs.
The White House Office of National Drug Control Policy declined to comment.
US Customs and Border Protection said it had data by country of origin only for 2015. Those figures showed nearly two-thirds of the 61 kilograms (134lbs) of fentanyl seized last year came from Mexico. The rest came from China.
DEA officials said Mexican cartels are key bulk suppliers of fentanyl to the US, but portrayed Mexico as a trans-shipment point.
Mexican officials said fentanyl and its precursors were coming from China. Only two labs trying to produce fentanyl from scratch have been located in Mexico in recent years, with others apparently taking simpler steps to turn precursors into fentanyl, the officials said.
Mexican authorities did not immediately respond to requests for seizure data by country of origin.
There is plenty of anecdotal evidence indicating that China plays an important role in the fentanyls trade, and despite disagreements, Chinese authorities have been proactive in trying to stop fentanyl manufacture and export.
China's narcotics commission said it is scrutinising 12 opioid vendors identified in previous reports, along with others which advertise fentanyl analogues.
In some cases, China has enacted faster, more comprehensive changes to its drug control laws than much of the rest of the world.
Beijing already regulates fentanyl and 18 related compounds and is considering designating four more: carfentanil, furanyl fentanyl, acryl fentanyl and valeryl fentanyl. In the meantime, the commission said it had warned Chinese vendors and websites that carfentanil and other analogs are harmful and should not be sold.
The resulting ripple of anxiety prompted some companies to recommend alternative opioids, like U-47700. "Friend, fent is illegal in China," wrote one. "It is dangerous for us."