How to tell if your students are being abused
Signs of child abuse
The quality of their schoolwork might also be a sort of sign. For example, if someone had great grades, and dropped to a d or f all of the sudden, they are either busy with other stuff, or they're being abused by parents, guardian, "friends", or a complete stranger
What to do if you suspect child abuse
Talk to the principal of their school as well as the police.