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  While the USDA approved 但ﾂ�ﾂ彝oundup Ready但ﾂ�ﾂ� alfalfa in 2011, many farmers argue that it is increasingly hard to prevent cross-contamination because the crop is pollinated by honeybees. In fact, many growers say they can但ﾂ�ﾂ冲 know until harvest whether their alfalfa may contain genetically modified organisms until it is too late.