Read our Privacy noticeAs Los Angeles Unified School District students return to classrooms on Wednesday for the start of the new school year, new restrictions on the use of digital devices during the school day will take effect. The restrictions form part of a broader district policy aimed at reducing student screen time across all grade levels. ( Getty/iStock )The district will also block student access to streaming platforms, social media, and YouTube unless access is explicitly approved by a teacher. The changes follow earlier district restrictions on student cellphone and social media use during school hours. According to the district, the nation's second-largest, the move positions it as "a national leader in setting thoughtful, research-based limits on student screen use and classroom technology tools."