50% of students say they have bullied other kids.

47% of students say they've been the victim of bullying that seriously upset them.

And now teachers are on notice. According to a 10-page letter sent to thousands of school districts and universities, the Department of Education's Office for Civil Rights wants to make sure that teachers and professors know that they could be held accountable for bullying under federal law.

To read the complete letter sent to teachers, click here.

To check out the latest survey done of teens on bullying from the Josephson Institute of Ethics, click here.