Good question. 1. No phones, no whatsapp. Criminal talk in person, police eavesdrop in person. Parity. 2. Phones, no whatsapp. Criminals talk on the phone, po

Good question. 1. No phones, no whatsapp. Criminal talk in person, police eavesdrop in person. Parity. 2. Phones, no whatsapp. Criminals talk on the phone, police eavesdrop on the phone. Parity. 3. No phones, whatsapp. Criminals talk on whatsapp, police eavesdrop in person. Imbalance. Recommended solution to imbalance: counteract technological barrier with a different application of similar technology. E.g. dragnet video recording.