A panel of scientists is disputing a World Health Organization report published earlier this year that concluded glyphosate, the world's most widely used weed killer and main ingredient in Monsanto Co's Roundup herbicide, is probably carcinogenic to humans. The 16-member panel, assembled by Intertek Scientific & Regulatory Consultancy, will present its findings to the annual meeting of the Society for Risk Analysis on Monday, aiming to publish the study at a later date after peer review. Monsanto paid Intertek for the panel's work. Concerns about glyphosate on food have been a hot topic of debate in the United States recently and contributed to the passage in Vermont last year of the country's first mandatory labeling law for foods that are genetically modified. Critics say that industry-linked scientists are downplaying the risk to human health and trying to discredit the IARC report by casting doubt on some of the scientific studies that it reviewed. Ten of the 16 scientists on the Intertek panel have been consultants for Monsanto in the past and two others are former Monsanto employees.