Along a desolate country road in northeastern Wisconsin, Manuel Estrada speeds toward work in his rumbling silver Ford SUV. He’s running late for his predawn shift. And he’s worried. His boss is counting on him; she’s been down a worker for a month. More than 400 Holstein cows stand blinking, waiting to be milked. His family needs the paycheck from his $11.50-per-hour job. And Estrada, 30, hopes the police aren’t waiting for him, too.