Food held, cooled, cooked, or reheated outside safe temperatures, letting dangerous bacteria multiply.
Cleaning chemicals or other toxic substances unlabeled or stored where they can reach food.
Surfaces that touch food — cutting boards, ice bins, dish racks — soiled or not sanitized.
Scoops and other in-use utensils stored improperly (e.g. handle down in the food).
Single-use items (cups, straws, to-go containers) stored or handled improperly.