Public health officials have issued new fish consumption advisories after finding elevated levels of a 3M perfluorinated chemical in bluegills from a Minneapolis lake and in Mississippi River fish as far south as Winona. The chemical, called P-F-O-S, is part of a family of compounds 3M once used to make water and stain-resistant products including Scotchgard. Studies have shown that high doses of P-F-O-S can be toxic to lab animals. It's not clear yet what exposure to the chemicals means for human health. Minnesota Public Radio's Lorna Benson reports.