According to statistics released by the United Nations Office on Drugs and Crime (UNODC). security agencies worldwide seized 36 tons of methamphetamine in 2012. Back in 2008, a total of 12 tons of meth was seized around the world.
Between 2007 and 2012, the seizure rate of ecstasy in the United States declined by 85 percent.
Source: Amar Toor, “New legal highs are flooding the market faster than governments can ban them,” The Verge, May 20, 2014.