It is possible that all of us are contaminated with at least one pesticide or other persistent organic compound residue, according to Spanish researchers. A study carried out by researchers from the Department of Radiology and Physical Medicine of the University of Granada, in collaboration with the Andalusian School of Public Health showed that 100% of volunteers tested in Spain tested positive for at least one persistent organic compound (POC). Juan Pedro Arrebola Moreno and colleagues measured the contamination levels of POC, including the fungicide hexachlorobenzene, DDE (a DDT metabolite) in almost 400 adults from an urban and a semi-rural region. 100% of subjects had DDE in their bodies. Polychlorinated biphenyls were seen at detectable levels in around 90% of the volunteers.