What indicates a potential issue with pest activity in food safety?

The presence of evidence of pests in refuse containers is a strong indicator of potential pest activity within a food safety context. Refuse containers can attract pests like rodents, insects, and other vermin if not maintained properly. When pests find a food source in the trash, they are likely to nest and multiply nearby, posing a significant risk to food safety.

Pest activity can lead to contamination of food products, which can result in serious health hazards for customers. Regular inspections of trash areas for signs of pests, such as droppings, nesting materials, or actual sightings, are crucial for maintaining a safe food environment. This response emphasizes the critical link between refuse management and overall kitchen hygiene and the importance of vigilance in identifying potential pest issues before they escalate. The other options do not directly indicate pest activity and focus instead on the general cleanliness or operational procedures within the food service establishment.