A lot of times, there is a lot of shuffling going on with the product, especially at a place like Wal Mart, where you can buy a lot more than groceries. So if you see them stacking the paper towels and shampoo into a different spot, and making two separate purchases, they most likely used food stamps for the food.
No need to make separate purchases or separate food items out. Hasn’t been since EBT cards came out.