https://www.vice.com/en_us/article/vdpb4y/the-cash-is-in-the-cutIn 2005, levamisole was found in almost 2 percent of the cocaine seized by the DEA. In 2007, the frequency went up to 15 percent, and by 2011 a staggering 73 percent of all cocaine seized by the DEA had been cut with levamisole. The same tendency is seen in Europe and in the samples I have analyzed myself. From 2008 to 2009, the frequency was around 66 percent, and from 2011 to 2012 it had gone up to 90 percent in Danish cocaine.
The 2006 potassium permanganate regulation was associated with a 22% seizure amount decrease (P < 0.05), 100% price increase (P < 0.05) and 35% purity decrease (P < 0.05).