Food was not kept cold enough, hot enough, cooled fast enough, or cooked or reheated to the right temperature. Bacteria grow quickly in the "danger zone" between 41°F and 135°F, which makes this one of the most important food-safety checks.
Toxic substances - properly identified, stored, used
In plain English
Cleaning products, pesticides, or other chemicals were stored or labeled in a way that could let them get into food. This is serious because chemical contamination can make people sick quickly.
Food came from an unapproved source, was missing required date marks or labels, or was past its use-by date. Knowing where food came from and how old it is helps prevent illness.