Residues of many types of insecticides, fungicides and weed killing chemicals have been found in roughly 85 percent of thousands of foods tested. Data released ... by the U.S. Department of Agriculture shows varying levels of pesticide residues in everything from mushrooms to potatoes and grapes to green beans. One sample of strawberries contained residues of 20 pesticides. Notably, the agency said only 15 percent of the 10,187 samples tested were free from any detectable pesticide residues. That's a marked difference from 2014, when the USDA found that over 41 percent of samples were "clean" or showed no detectable pesticide residues. Prior years also showed roughly 40-50 percent of samples as free of detectable residues. Absent from the USDA data was any information on glyphosate residues, even though glyphosate has long been the most widely used herbicide in the world. The Food and Drug Administration also annually samples foods for residues of pesticides. The most recent public residue report issued by the FDA shows that violation rates for pesticide residues have been climbing in recent years.