Years ago a good friend of mine was trying to get a business tenant of his to leave the property as he wasn't getting his rent, and he visited a location in a small town in SC where a group of men were mixing some liquid that they called "ink" into sawdust so that it could be put in the landfill, or that's the story my friend related to me about what was going on at a somewhat small shack in the backwoods of South Carolina. (I stayed in the picup while he stepped out and talked to his tenant's relatives) The "ink" supposedly came from "up North" somewhere. Not being familiar with this process, we were speculating why this liquid was being mixed with sawdust, which was plentiful in that area due to some lumber mills in the area. But I realize now that someone must have been smuggling this liquid down South in order to dispose of it cheaply at the low landfill rates in South Carolina. And many years from now, or next year, or perhaps never, it will be discovered that the groundwater is contaminated with this unknown fluid. However, we never knew for sure what that liquid was and I suppose we never will. But I suspect this type of operation goes on much more than many people realize. But I have one word of advice. When you hit South of the Border or I-95, think twice before drinking the water. Maybe bottled water is the best method of dealing with the problem in those parts. That payback on that sawdust must have been pretty high. But who knows, maybe it was turned into particle board and is in your home now. Some things will forever remain a mystery I suppose, although the Chinese drywall may not have anything better to sell than the US producers of sawmill dust.