( February 13, 2024, 11:53 AM EST) -- SAN FRANCISCO — The U.S. Environmental Protection Agency on Feb. 12 filed an answer in a case that is currently in trial in California federal court, arguing that the claims against it for causing an “unreasonable risk of injury” due to the artificial fluoridation of drinking water are “too vague and ambiguous” for the agency to “formulate a response.”...