SAN DIEGO: In response to a California lawsuit to require mercury warnings on canned tuna, the US Tuna Foundation is working with AOR Ruder Finn to affirm that its members' products are safe.Ruder Finn's Lisa Gulledge declined to discuss specifics of the ongoing PR campaign since the agency is "right in the middle" of it. In a statement, Tuna Foundation director David Burney noted that the suit "will needlessly scare consumers away from affordable foods that are good for them." The press release also states that the law in question, Proposition 65, which requires warnings when there is potential for exposure to carcinogens or reproductive toxins, does not apply to "natural sources" like fish. State attorney general Bill Lockyer told the Los Angeles Times that he plans to combine the suit with one already filed by the Public Media Center, a nonprofit advocacy agency. The Tuna Foundation is already working with the Public Media Center to develop an educational campaign targeting pregnant and nursing women. The new case could affect, and ultimately delay, the design of that campaign, according to Gulledge.