Under what condition should frozen food be rejected?

Frozen food should be rejected if it contains ice crystals or water stains because these signs indicate that the product has likely been subjected to thawing and refreezing. When food thaws, it can develop ice crystals on its surface, which affect its texture and quality. Additionally, the presence of water stains suggests that moisture has escaped from the food, leading to potential spoilage. This may also indicate a breakdown in the cold chain, compromising the food's safety. Maintaining consistent freezing temperatures is crucial to prevent the growth of harmful bacteria, and visual indicators like ice crystals are essential for ensuring food quality and safety.

The other conditions listed either do not necessarily indicate food safety issues or are more related to labeling and packaging requirements rather than the integrity of the food itself.