A 3M environmental specialist, in a scathing resignation letter, accused company officials of being unethical" and more "concerned with markets, legal defensibility and image over environmental safety" when it came to PFAS, the emerging contaminant causing a potential crisis throughout Michigan and the country. [The] explosive resignation letter is just one of a large cache of internal 3M memos and documents obtained by the Free Press through public records law from the Minnesota Attorney Generals Office. Then-Minnesota Attorney General Lori Swanson obtained the internal documents from the Minnesota-based company after suing 3M in 2010 over its environmental contamination in the state. The company settled the suit last year for $850 million. The nonstick compounds were used for decades ... in aqueous firefighting foam, industrial processes and a host of popular consumer products: Teflon nonstick pots and pans, ScotchGard stain protectants ... Gore-Tex water-resistant shoes and clothing, and more. But the same qualities that made PFAS compounds so useful also makes them almost indestructible in the environment, giving them the ominous nickname "the forever chemicals." PFAS can now be found in the blood of nearly 99% of Americans. It has even been found in polar bears in the Arctic Circle. Some 46 sites in Michigan are known to have groundwater with PFAS levels above the U.S. Environmental Protection Agency's lifetime health advisory guideline