The prospect of facing a patchwork of state labeling requirements caused food companies to push Congress to pass national labeling legislation that would supersede state laws. The House passed a voluntary labeling bill last year that went nowhere in the Senate, which is now considering its own legislation.If asked, most everyone would agree that approaches to questions about food safety should be based on sound science. Even most Europeans might agree with this, however grudgingly. The problem is that many critics of big agriculture and the way food is produced and marketed contend that science can be sound only if it supports their views and biases. This is particularly true for opponents of GM crops and food produced from them. They are u...