California warns all public school students of data stolen in contractor breach

California's education department has issued warnings to public school students that their data may have been stolen due to a breach at a contractor. The contractor, Educational Testing Service, experienced a data breach that lasted for months. The warnings were released by the California Department of Education over the course of the last week. The breach is related to assessment services provided by Educational Testing Service. The department's warnings are intended to inform the state's students of the potential data theft.