The DDS have conducted a test interception of a "interstellar missile" (the DDS did not mention the Clones' CSM by name but its obvious this was the missile the test was against). A modified Ferret-G was outfitted with a cloak and then set on a preprogrammed attack vector. The DDS say they detected the Ferret even though its cloak was operational.
The DDS have not said how they did this though it is thought they used neutrino grids and other detection methods to find the missile. How useful the test was is unknown. By their nature systems like neutrino grids can only be deployed on a limited scale due to cost and technical limitations so the DDS had to know a missile was coming and roughly where it was. These are not necessarily things the DDS would know if faced by a real CSM.
