A DNA profile recovered from gloves found duringthe investigationinto the disappearance of Nancy Guthrie in Arizona that was submitted to a national database maintained by the FBI didn't come back with any matches, the Pima County Sheriff's Department said Tuesday.
The profile was submitted to the database known as CoDIS, or Combined DNA Index System, Tuesday morning, the sheriff's department said. The department said in a statement that there have been no confirmed CoDIS matches in the investigation at this point.
Investigators will be searching commercial genealogy databases with the same DNA profile for a possible match, a federal law enforcement source told CBS News. Those databases are completely different from the CoDIS national database.
Additional DNA evidence that was found at Guthrie's home was also being analyzed, the sheriff's department said. It also noted the DNA from the gloves did not match the DNA found at the property.
The national database maintained by the FBI could have provided a match if the individual had a previous arrest for certain crimes and supplied a DNA sample that put him into the system.
The DNA profile of an unknown male wasrecovered from glovesthat investigators found about 2 miles from Guthrie's home, according to the FBI. The glove appeared to match the ones seen on the suspect in Guthrie's Nestdoorbell camera video.
The gloves were found in a field near a roadside, the FBI said. It was one of 16 gloves found in various areas during the search, but most of them were determined to belong to investigators who had discarded them, the FBI said.
CBS News also learned Tuesday that the FBI is probing gun purchases in the Tucson area.
According to the owner of an area gun store, an agent came in about a week or so ago and showed him several images with faces and names on them. Agents inquired about purchases in the last year. The owner said there were several names and images on the sheets but doesn't remember a specific number of people listed. CBS News agreed not to name the store owner due to privacy concerns.
Earlier Tuesday, the sheriff's department confirmed that investigators are attempting to locate Guthrie's heart pacemaker and are working with the manufacturer and experts in the field.
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The Parsons Corporation said in a statement that the company has been assisting with the search for Guthrie. The company said it deployed Bluetooth and Wi-Fi sensors that are intended for search and rescue operations in "challenging environments." The sensors give first responders a heat map that identifies signals in a search area, according to the company.
The sensors were used on Feb. 3 when the sheriff's department was conducting a helicopter search over Guthrie's neighborhood as well as in additional search operations by helicopter, ground vehicles and on foot, the company said.
Law enforcement sources had told CBS News that one of the high-tech tools investigators have deployed in their search is a trackingdevice known as a "signal sniffer"in an effort to detect possible signals from the pacemaker.
Officials said Guthrie's pacemaker app showed a disconnect from her phone at 2:28 a.m. on Feb. 1, the day she was reported missing.
The sheriff's department also said investigators are working with Walmart to identify the individual who purchased the backpack the suspect was carrying in the doorbell camera video.
The FBI identified it as a black, 25-liter Ozark Trail Hiker Pack backpack, and CBS Newsfirst reportedthat it is sold exclusively at Walmart.
Pima County Sheriff Chris Nanos told CBS News the backpack was "one of the most promising leads" in the case.
Investigators were also canvassing businesses to see if the suspect from the doorbell video appears familiar to anyone, the sheriff's department said.
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