'History in the making': California aims for world's highest farm animal welfare law

New law would ban the sale of all eggs, pork or veal from a caged animal, putting the state ahead of the EU - if campaigners can get enough signatures

They call Chris Winn the signatures guy. A delivery driver by day, he spends his free time drumming up support for animal rights. "When I did the shark fin ban I got 4,000 signatures," says Winn, 53. "Usually I'm the top guy in California."

Now he's on a new mission. It's a cold Saturday afternoon in San Francisco and Winn is jubilant, bundled in a hat and sweatshirt, scouting for signatories for a proposed law that would ban the sale of any eggs, pork or veal that comes from an animal that spent its life in a cage. If passed it would be the most progressive farm animal welfare law in the world.