Nebraska Attorney General Mike Hilgers is part of a multi-state coalition asking the Environmental Protection Agency to create a national standard over glyphosate. Glyphosate is the active ingredient in weed killers. Despite a decade-old study that detected glyphosate in 81 percent of a U.S. sample population's urine, the EPA says it has found no evidence of the ingredient being a cancer risk. The petition asks the EPA to make a ruling on the matter within 90 days.