Two senior California officials, flanked by environmental lobbyists and "Seinfeld" television star Julia Louis-Dreyfus, on Thursday proposed a law that would bar most US state agencies from buying petrol guzzling sport utility vehicles, Reuters reported. The bill, spearheaded by senate president pro tem John Burton and state treasurer Phil Angelides, who are both Democrats, would exempt state police and emergency services but force other agencies to justify an SUV purchase because of concerns over safety, cost and the environment, the news agency added.