- School official says more than 60 children were tested Thursday
- The tests come after findings of elevated water lead levels in public schools
- Out of about 2,067 samples collected between 2012 and 2015, about 12% reflected lead levels above the federal action level
- Teachers Union and environmental group point finger at neglect by school administrators
(CNN)Voluntary blood testing began Thursday for Newark public school students, a day after officials announced that lead levels in the district's water have been elevated since at least 2012.