Organic fertilizer comes naturally without industrial additives and includes manure, mud, worm alloys, dried, seaweed, dummy acid, and flying throat. Sewage was used in organic agricultural processes in many countries, including the United States, but has become very limited and scarce due to the prohibition by the United States Department of Agriculture (and the rest of the States) of the practice (due to the accumulation of toxic metals, and the transmission of infectious diseases among other factors).