If you are in arrears with child support, the first thing they do is take your federal tax refund. A coworker hasn't seen his refund in 5 years. My brother was in jail because he lost his job. He owed a year because he hooks up with someone and lives off them instead of getting another job. Still owes child support and he was in jail until it was paid. Mom had to bail him out, and the next time he lost his job, he lost his tax refund for I don't know how long to pay it back the 2nd time (managed to stay out of jail.)
i know someone whose mother's estate was a time consuming pain to settle b/c child support enforcement caught wind of mom's passing and her will was set up to be evenly split between her adult kids-one of whom owed a ton of back child support. the bulk of what would pass to them was the equity in the mom's home that needed to be sold. every penny had to be accounted for on that estate to ensure nothing was being sheltered from child support for the one brother's share.