The aim of the current study is to perform a systematic investigation about the interception of milk and dairy products during agricultural product transport inspections carried out in Maranhão State. A retrospective study was conducted over a five-year period; it recorded 90 mobile monitoring events that together intercepted 3,500 liters of milk, 500 liters of kitchen butter, 2,836 kg of cheese, 1,700 kg of yogurt and 100 kg of yogurt ice cream. Most of these products (n = 13/16; 75%) were intercepted during their transportation from one city to another. The most recurring law violations regarded products transported in inappropriate vehicles (e.g., in the trunk of passenger buses and minibuses and in trucks used for animalfeed transportation) and in inappropriate packages such as garbage bags, rice-packing bags, cardboard boxes and non-reusable containers for micronutrients. All law violations recorded during the interceptions resulted in product confiscation, in fine issuing and, in specific cases, in product destruction through povidone iodine application. Fines issued due to irregular transportation of animal products during the assessed period accounted for R$ 11,688.00. It was possible concluding that the transportation of milk and dairy products in Maranhão State is not in compliance with the Brazilian legislation (ordinances, decrees), a fact that may endanger public health in the investigated State, as well as in other Brazilian cities that trade these products. It is essential intensifying these inspections to help suppressing the illegal trade of milk and dairy products.