Family Dollar Stores has agreed to pay a record fine for shipping goods from a warehouse that it knew was rat-infested. The company was fined $41.7 million, a record in a food safety case, after it pleaded guilty Monday to holding food, drugs, medical devices, and cosmetics under insanitary conditions, NBC News reports. Under the plea deal, Family Dollar and its parent company, Dollar Tree, will have to “meet robust corporate compliance and reporting requirements for the next three years,” the Department of Justice said in a press release. The department said stores had reported receiving rode…