Stepping into the middle of a growing debate, a freshman assemblyman has introduced legislation that would make companies developing genetically engineered crops liable for damages if their work results in contamination of other fields. The bill by Assemblyman Jared Huffman also would ban open-field production of genetically engineered crops used in the development of medications. And it would require growers to give county agriculture commissioners at least 30 days notice before engaging in open-field development of other genetically modified plants. Huffman, D-San Rafael, said the measure is needed to protect California farmers against significant losses if their conventional or organic...