Food Safety Reports: Walmart Supercenter, East 4th Street, Watkins Glen, NY, USA

Wednesday April 6 2022, My stepfather was perfectly fine Tuesday, April 5. Wednesday April 6 he became violently ill. He is totally incapacitated. Vomiting, a lot of pain. He eats Lucky charms every day. How do I know if the cereal he has is poison?
60.351.2726  | Symptoms: Nausea, Vomiting, Other