What must a food handler do first if they see mouse droppings in a food storage area?

If a food handler sees mouse droppings in a food storage area, they must immediately stop any food handling activities and secure the area to prevent further contamination. They should then report the findings to a supervisor or manager to initiate a proper response, including cleaning and sanitizing the affected area and investigating the source of the infestation. It's also important to document the incident for future reference and to follow up on pest control measures.