San Francisco District Attorney Kamala Harris' office violated defendants' rights by hiding damaging information about a police drug lab technician and was indifferent to demands that it account for its failings, a judge declared Thursday. Superior Court Anne-Christine Massullo stopped short of granting a request by more than 40 drug defendants that their cases be dismissed because of prosecutorial misconduct, saying that decision must be left up to the judges hearing their cases. But in a scathing ruling, the judge concluded that prosecutors had failed to fulfill their constitutional duty . . .