BEIJING, March 27 (Xinhua) -- Chinese police handled 583 cases related to drug production and busted 438 drug-production dens nationwide last year, according to a report released by the National Narcotics Control Commission Monday.
The report said police uncovered 33 cases that involved more than a tonne of drugs in 2016, more than double the previous year. There were also 78 cases involving more than 100 kilograms of drugs, a year-on-year increase of 32 percent.
Last year, police uncovered 444 cases for producing, transporting, selling and purchasing chemicals and equipments used in drug production, according to the report.
It also noted that China faced great challenges in controlling new psychoactive substances, saying that despite the country listing 116 psychoactive substances as controlled substances in October 2015, illegal drug producers continue to create new drugs.