Maplewood is most likely following guidelines and is perhaps concerned about potential litigation when transmitting (PII) in the clear. It is unlikely a secret squirrel division is running around.
ChatGPT.
Summary: Protection of Personally Identifiable Information (PII) in Public Safety Two-Way Radio Communications
Two-way radio communications used by public safety agencies (e.g., police, fire, EMS) often involve the transmission of sensitive data, including Personally Identifiable Information (PII)—such as names, addresses, dates of birth, Social Security numbers, medical conditions, and other details that can identify individuals.
Due to the nature of traditional analog and non-encrypted digital radio systems, these communications can be intercepted by the public through commercially available radio scanners. This presents a significant privacy and security concern.
Federal Recommendations:
Several federal agencies, including the Department of Homeland Security (DHS) and National Institute of Standards and Technology (NIST), have issued guidance recommending that public safety agencies:
• Implement end-to-end encryption for radio transmissions that contain PII or other sensitive information.
• Develop policies and procedures governing when and how encryption should be used.
• Use P25 digital radio systems with encryption capabilities, which allow secure communication between authorized users while maintaining interoperability across jurisdictions.
Key Documents:
• NIST Special Publication 800-82 and related cybersecurity guidance.
• DHS SAFECOM Guidance on Encryption (various editions), which promotes proper planning, key management, and training for encrypted public safety radio use.
• Encryption improves privacy and data protection but must be balanced with the need for interagency interoperability, especially during mutual aid or multi-agency incidents.
• Proper encryption key management is essential to ensure that authorized users can communicate securely while unauthorized access is prevented.
• Agencies are encouraged to segment radio talkgroups to allow encryption where needed (e.g., for investigative or medical information), while keeping other channels open for routine or public communications or interoperability.