Can my dad sue the school where he works, if a firecracker thrown into his classroom by some students injured his hearing?

Question Details:

My dad has suffered what appears to be a worsening hearing loss after a firecracker exploded in his classroom. He and other teachers at his school have been suffering from several student pranks. The school director doesn't bother keeping the order or pursue any legal actions. Can he sue the school?

AttorneyPages.com Important Notice