WASHINGTON (AP) — Federal officials sued a Louisiana chemical maker on Tuesday, alleging that it presents an unacceptable cancer risk to the nearby majority-Black community and demanding cuts in toxic emissions. The former DuPont plant has reduced its emissions over time, but the Justice Department, suing on behalf of the Environmental Protection Agency, said the plant still represents “an imminent and substantial endangerment to public health and welfare,″ including elevated cancer risks. ”“For decades Black families have been human experiments for the petrochemical industry in Louisiana,” she said