well, the separation of communication systems (air gap = two phones) is traditionally considered a proven method for protecting highly confidential communication systems, funnily, I must admit that I happen to be an expert in bridging this separation with ultrasound, tehe 😁
Have the police Officer speak into the phone and confirm something into the phone by saying "Yes, a dozen doughnuts." Have the pink alien reach behind him and retrieve a long eel from his back and to lazily start eating it.