“According to the U.S. Drug Enforcement Agency, levamisole has become increasingly popular as a “cut,” or diluting agent, in cocaine and possibly some heroin. It is now found in 70% of all cocaine seized in the U.S., up from 30% in 2008.”
Read more: http://www.time.com/time/health/article/0,8599,1955112,00.html?xid=rss-topstories#ixzz0dNLAJdMw