A shipment of frozen shrimp arrives. Which sign indicates it was thawed and refrozen and should be rejected?

解析

Frozen food should be received frozen solid; signs of thawing and refreezing, such as large ice crystals, pooled frozen liquid, or water stains on the case, indicate time-temperature abuse and require rejection. A cold case, rock-hard shrimp that still rattle loose instead of being frozen into a block, and a label listing the harvest date, lot code, and plant number are all good signs, not reasons to reject. Refreezing lets pathogens grow during the thaw period.