Ever since Monsanto introduced its line of Roundup weedkillers to the world in 1974, the products have been touted by the company and regulators as extremely safe. But the emergence of long-held corporate secrets in three public trials has revealed a covert campaign to cover-up the pesticides risks and raised troubling questions about lax oversight of all pesticides by the Environmental Protection Agency and other regulatory agencies. Two recently concluded Roundup product liability trials in California have resulted in large damage awards against Monsanto, after juries found the companys herbicides contributed to cancer and that it failed to warn of the risks. Monsanto never conducted epidemiology studies for Roundup and its other formulations made with the active ingredient glyphosate, to see if the products could lead to cancer in people who used them. At the same time ... the company was spending millions of dollars on secretive PR campaigns including $17m budgeted in a single year to finance ghostwritten studies and op-eds aimed at discrediting independent scientists whose work found dangers with Monsantos herbicides. When the US Agency for Toxic Substances and Disease Registry sought to evaluate glyphosate toxicity in 2015, Monsanto ... engaged the assistance of EPA officials to delay that review. The efforts delayed the release of the public draft of the review ... until earlier this month. As Monsanto had feared, the agencys review found links between cancer and glyphosate.