Child support agencies have many tools to help them enforce child support orders. Some tools, such as charging interest on past-due support, are done automatically. For the most efficient and effective use of staff time, child support agencies use their experience to choose what tools (actions) they take and when. For instance, they might write warning letters before they take a more drastic action. Some enforcement tools and actions require due process or a court action. Jail is not always the best way to get money for your children.