Are there magic words I need to use to claim good cause?

There are no "magic words" that you must use to claim good cause not to cooperate with DCS. However, different people may use different words to talk about the same thing.

Make sure the CSO worker knows you are afraid that DCS efforts to establish or collect child support may be dangerous for you or your children. Try to use the phrase "good cause not to cooperate with DCS," or "child support good cause." That way, you can know you clearly made your point that you are worried about how your abuser may react when DCS tries to collect child support.