If you think your ex has moved out of state, you or the D.A. can use legal procedures to locate your ex and seek payment. Federal and state parent locator services can also assist in locating missing parents.
If you know that your ex-spouse lives in a different state, you can use the Uniform Interstate Family Support Act (UIFSA) to enforce a child support order. Under this law, you have a number of options. You can:
The Child Support Recovery Act (CSRA) of 1992 makes it a federal crime for a parent to willfully refuse to make support payments to a parent who lives in another state. However, this statute has been challenged on constitutional grounds (as being beyond the authority of Congress), and its enforcement is inconsistent. Possibly as a remedy to CSRA, Congress passed the Deadbeat Parents Punishment Act of 1998, making it a felony to willfully refuse to pay out-of-state child support.