Food held, cooled, cooked, or reheated outside safe temperatures, letting dangerous bacteria multiply.
Food from an unapproved supplier, unsafe or spoiled food, missing shellfish harvest tags, or raw fish without required parasite destruction.
Roaches, rodents, flies, or other pests present — or doors and openings that let them in not protected.
High-risk food (like meat) thawed improperly, promoting bacterial growth.