SAN FRANCISCO -- If a teacher doesn’t measure up, should he or she jump over other applicants for a job at a different school? Not anymore, at least not in California’s neediest schools. A new state law bars school districts from forcing principals at low-scoring schools to hire teachers who transfer from elsewhere in the district.In a move watched by educators across the nation, California’s Legislature and Gov. Arnold Schwarzenegger (R) concluded that the preference system had allowed transferring teachers, often with weak records, to bump newer teachers from schools that needed them most, even when the principal preferred the...