Cattle can both themselves be laundered (if they are grazed on land that has been illegally cleared and converted to pasture) and used as a means of laundering criminal proceeds from other exploits, like drugs trafficking. In Brazil, cattle have been laundered to obscure their links to land clearing, when they are moved from ranches that have contributed to land conversion through "clean" ranches that have not resulted in recent forest loss. In 2009, several Brazilian slaughterhouses signed the Terms of Adjustment of Conduct, an initiative of the Federal Prosecution Office and the Public Commitment on Cattle Ranching, and a voluntary protocol developed by Greenpeace, which precludes them from purchasing cattle reared on deforested land. However, a single cow might pass through up to 10 farms before it is slaughtered (from birth, through rearing and fattening). Any of these farms might be linked to illegal deforestation but many slaughterhouses assess links to deforestation only on the last farm a cow passes through - their direct supplier. As long as the last farm in the supply chain is from a "clean" ranch that is free from recent deforestation then slaughterhouses (and subsequent transporters and retailers, like supermarkets) are likely to mark them as deforestation-free, even if they have spent the majority of their life on and have passed through nine other ranches that have been converted from forested land. Indeed, data indicates that some ranchers own both "dirty" and "clean" ranches and launder cattle through their own properties. So long as one property is kept clean, they can continue to clear land for cattle grazing purposes on any number of other ranches. Other investigations by Global Witness have found that ranchers have fraudulently edited the boundaries of their ranch once they have cleared areas of land, so that this land conversion is no longer included within the property's scope and the ranch appears free from deforestation. This is alleged to be the case for the Fazenda Espora de Ouro II Ranch in Brazil's Pará state, which Global Witness also found appears to be registered in the name of an individual who could not legally be its owner (based on assessment of a database of land titles and beneficiaries). Cattle can also 'and concurrently' be used as a means of laundering the proceeds of illicit activity. Drug traffickers, especially in Colombia (where the traceability of beef produce is particularly poor), Honduras, and Guatemala, are known to launder revenue from drugs by buying or grabbing land which they convert into pasture for cattle, which they also purchase with narcotrafficking proceeds. When the cattle are sold, profits are hard to trace back to the drug network and their illicit proceeds are effectively laundered. This practice, known as "narco-ranching", is suspected of contributing up to 87% of deforestation in the Maya Biosphere Reserve, a large UNESCO heritage area of forest which covers over 2 million hectares of rainforest across northern Guatemala and borders other protected forests in Mexico and Belize. The Reserve is highly vulnerable to deforestation by crime groups due to its strategic location along a significant drug trafficking route up through Guatemala and Mexico leading to the US. Cattle ranching in such areas also frequently serves to hide airstrips and production facilities used by traffickers to produce and transport drugs or other illicit products. Airstrips now pepper the Maya Biosphere reserve, which are used by planes coming in from Colombia and Venezuela with cocaine to be smuggled across the border into Mexico.