The World Health Organization has found a conclusive link between lindane, a common pesticide once used for lice and scabies treatment as well as agricultural applications, and developing non-Hodgkin’s lymphoma (NHL), reports Reuters. The WHO also found a similar connection between DDT and an increased risk in NHL, testicular cancer and liver cancer. After being banned for agricultural use in 2009, lindane was still exempted for lice or scabies treatment when necessary. Meanwhile, although DDT was banned in the 1970s, remnants persist throughout nature which may still pose a risk. The observed effects were so severe that in the U.S. and Canada, researchers saw a 60% increase in NHL risk for those exposed to lindane.