(05-21) 04:00 PDT Washington - -- When federal agents raided a San Rafael apartment complex in the early morning hours of March 6, 2007, searching for 30 undocumented immigrants, they left behind a lot of terrified children, Kathryn Gibney, the principal at nearby San Pedro Elementary School, said.The agents shone flashlights in the children's faces. Several parents were handcuffed in front of their kids. The next day 40 of the school's 400 students were too frightened to show up for class, and others arrived in tears. A year later, Gibney said the effects continue with higher absenteeism, lower test scores...