Several years ago, I was having a conversation with a police officer about radar. He was explaining that his department had "new" superwide KA band radar guns that had the ability to hop around on five different frequencies on the KA band to avoid detection. He more or less implied that radar detectors were totally obsolete against this gun because it put out the signals so quickly that the filtering circuitry in detectors would reject the brief signals as false alarms.
First of all, does this really exist?
Second, if it does, is it detectable by current detectors?