TUCSON, Arizona — The search for missing Arizona woman Nancy Guthrie has entered a critical new phase as federal investigators deploy advanced technology in an effort to locate her.

Authorities from the Federal Bureau of Investigation confirmed that specialized electronic detection equipment is now being used as part of the ongoing search. The technology is designed to detect extremely faint wireless signals that may be emitted by certain medical devices.

Investigators say the move reflects the growing urgency surrounding the case.

Technology Focused on Medical Device Signal

According to officials involved in the search, Guthrie relies on a pacemaker — a medical device that can sometimes emit a Bluetooth Low Energy signal used for monitoring and maintenance.

Federal agents are now attempting to detect that signal.

The specialized equipment, sometimes referred to as a “signal sniffer,” is capable of scanning for weak Bluetooth transmissions within a limited range. Investigators believe that if the device is still active, it could provide a crucial clue to Guthrie’s whereabouts.

Search teams have been scanning multiple areas as they attempt to pick up any electronic trace linked to the device.

Aerial Search Expands

Helicopters have also been deployed to assist in the effort.

Authorities confirmed that aircraft are conducting low-altitude search patterns over several remote areas near Tucson. The goal is to determine whether the signal from the pacemaker can be detected from the air.

While the technology has limitations, experts say even a brief signal could significantly narrow the search area.

“If the device is powered and broadcasting, it might only be detectable within a relatively short distance,” one medical technology specialist told reporters.

“That means investigators have to be extremely close to the source.”

Thousands of Tips Flood In

Since Guthrie’s disappearance, investigators have received thousands of tips from the public.

Officials say every lead is being reviewed, though many have turned out to be unsubstantiated.

Authorities have also released surveillance images believed to show a possible person of interest captured on security cameras. The individual appears in footage recorded near the area where Guthrie was last seen.

Investigators have not publicly identified the individual and have not confirmed whether the person is directly connected to the disappearance.

Possible Motive Remains Unclear

Despite weeks of investigation, authorities have not publicly confirmed a motive in the case.

However, a source familiar with the investigation says detectives are exploring several possible scenarios, including the possibility of a targeted abduction.

Another report circulating online suggests investigators have examined digital financial activity connected to individuals in Guthrie’s extended network. Officials have not confirmed those claims.

Law enforcement sources say the case remains active and complex.

Reward Offered for Information

The FBI has announced a reward of up to $100,000 for information that leads to locating Guthrie or identifying those responsible for her disappearance.

Investigators continue urging anyone with relevant information to contact authorities.

“The smallest detail could make a difference,” one official said.

Family Continues to Hope

Meanwhile, Guthrie’s family has continued to appeal to the public for help.

Friends and relatives have described her disappearance as completely out of character, saying she would never vanish without contacting loved ones.

Community members have also organized search efforts and vigils as the investigation continues.

For now, investigators are hoping that the new technology may provide the breakthrough they need.

Whether the faint signal of a medical device could ultimately lead authorities to Guthrie remains uncertain — but for those searching, it may represent one of the most promising tools yet in the effort to bring her home.