CHATTANOOGA (WRCB) – The Tennessee Bureau of Investigation is lending a hand in the search for a missing Signal Mountain mother, albeit in a diminished role.

TBI Special Agent in Charge Jerri Powell tells Eyewitness News the agency has been assisting the Hamilton County Sheriff's Office review evidence related to the disappearance of Gail Palmgren.

"We have not been officially asked to be a part of the investigation," Special Agent Powell says.

The TBI has been aiding by examining the evidence collected by deputies and the Signal Mountain Police Department and offering suggestions.

"They're just putting a second set of eyes on the evidence," Powell says.

The amount of evidence could grow substantially. Last month, Matthew Palmgren agreed to allow investigators to search the family's properties as long as one of the family's lawyers was present.

Those properties include the family's home in Signal Mountain, Matthew Palmgren's mother's home in Chattanooga, a house in Montgomery, Alabama, the lake house in Wetumpka, Alabama and a storage unit in Red Bank.

That evidence could also eventually include a hard-drive from a security system at the family's lake house which Gail Palmgren's friend Arlene Durham says Gail gave to her for safe keeping just before she disappeared.

Gail Nowacki Palmgren was last seen April 30. She was seen driving her crimson Rubicon Jeep with tire cover that says "Life is Good" and a personalized Alabama tag reading "EAZY ST". If you have seen Palmgren or her Jeep call Signal Mountain Police at 423-886-2124.