A Wisconsin school district is not liable for any damages sought by a former student who alleges she was sexually abused by a school employee throughout her eighth-grade year, an en banc federal appeals court held Tuesday.The 7th U.S. Circuit Court of Appeals declined to revive a lawsuit accusing the Madison Metropolitan School District of violating Title IX by failing to halt the sexual abuse purportedly inflicted on student C.S. by a school security assistant.Title IX of the Education Amendments of 1972 prohibits sex …