A plant genetics conference in Minneapolis this week has drawn protesters who oppose the use of genetically modified foods. The conference, sponsored by the Cambridge Healthtech Institute at the Marriott downtown, addresses uses of genetics in crop production. But neither the Minneapolis police department nor the protesters are looking to repeat the confrontations that occurred at an animal genetics conference in July. Those face-offs resulted in arrests for demonstrators and criticism of police tactics. Minneapolis Public Radio's Amy Radil reports.