🔎 1. Pacemakers are not GPS trackers
Most modern pacemakers:

Do not broadcast continuous Bluetooth signals.

Communicate intermittently with a nearby home monitor (usually within a very short range).
Are not designed to be tracked from helicopters or long distances.
While some devices allow wireless data transfer for medical monitoring, they are low-power systems intended for clinical use — not real-time geolocation tracking.

🚁 2. Helicopter Bluetooth sweeps are highly unlikely
Bluetooth signals generally have a limited range (often tens of meters, sometimes slightly more under ideal conditions). Detecting a specific implanted medical device from the air over a wide area would be technically improbable and has not been publicly documented as a standard FBI search method.

📰 3. No confirmed public case
There are also no widely verified reports of an active FBI manhunt involving Nancy Guthrie in Tucson, Arizona. Claims about sudden device disconnection, instant signal detection, or imminent breakthroughs appear to be circulating primarily in viral social media posts rather than confirmed law enforcement briefings.