Newly surfaced emails and medical records shed light on what parents reported after 22 people were hospitalized following an incident at Pleasure Ridge Park High School in Louisville, but the cause remains unexplained. The school was evacuated Sept. 21, 2026. Parents questioned whether a chemical exposure had made people sick and how the school responded. A Jefferson County Public Schools board member said the district still had not explained what caused the illnesses. The unresolved questions leave families without a clear account of what happened at the school or what, if anything, may have exposed students and staff. The available information does not identify a confirmed cause.