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Donovan prepares one of the 370 formulas he has devised –and memorized– in order to carry out his forensic cleaning, in the utility room behind the kitchen of his home in Texcoco, Mexico on September 21, 2015. The chemical base for some of his formulas, he says, can cost up to $6,000. Donovan Tavera, 43, is the director of “Limpieza Forense México”, the country’s first and so far the only government-accredited forensic cleaning company. Since 2000, Tavera, a self-taught forensic technician, and his family have offered services to clean up homicides, unattended death, suicides, the homes of compulsive hoarders and houses destroyed by fire or flooding. Despite rising violence that has left 70,000 people dead and 23,000 disappeared since 2006, Mexico has only one certified forensic cleaner. As a consequence, the biological hazards associated with crime scenes are going unchecked all around the country. Photo by Bénédicte Desrus