A law passed nearly a year ago to help curb human trafficking in the state still has never been used to prosecute those suspected of enslaving immigrants, proponents of the bill said. Gov. Arnold Schwarzenegger said he hoped the bill would be a national model in countering modern day slavery when he signed it into law last year. The bill, he said, would end "a horrific crime that our society cannot abide." But authorities say the law makes it too difficult to prove immigrant workers were being held against their will, one of the criteria for classifying victims of human...