There's already loopholes that people exploit with many welfare programs and this child support idea likely won't be different. Here's how the loophole works. First, go to a store that has something you want, Walmart is very common. Buy what you're allowed to. Then go straight to the returns department in the store and return everything you just bought for store credit/giftcard. Now you have free reign to buy anything you want or sell the giftcard for cash. This is the common workaround.