The FDA has issued a warning regarding frozen shrimp sold at Walmart that may be contaminated with radioactive material. Investigations are ongoing after radioactive shrimp bound for Walmart were detected at major ports, leading to recalls in at least 13 states. The agency advises consumers not to eat shrimp under the Great Value brand and urges customers to check their freezers for potentially affected products. The health risks associated with consuming the contaminated shrimp have raised significant concerns.