The ABPR also divides the material into three risk-based categories (Table 3). Category 1 is the category with the highest risk of contamination. Heavy metals, persistent organic compounds like dioxins and PCB, or non-classical diseases like TSE cannot be sufficiently destroyed by normal rendering and should thus not be recycled into the food and feed chain. Category 2 poses a known and manageable risk of diseases that can be reliably reduced by a sterilisation step. Recycling into technical products like fertiliser is allowed. Category 3 is the lowest risk category. It includes mainly ABP fit for human consumption (but not destined for human consumption), and other ABP from healthy slaughtered animals, e.g. feathers, bristles, horns. Category 3 products can be used as animal feed (but not for human food!). Catering waste including Used Cooking Oils (UCO) is considered to be category 3 as well but its use in feed is not allowed. With an increasing risk there are a decreasing number of different uses allowed