AMNA NAWAZ: Federal and state law enforcement# are still looking for Nancy Guthrie,## the mother of Today Show co-host Savannah# Guthrie.

Local police address rumors today## that Guthrie family members may have# been involved in her disappearance.

In a statement, Pima County sheriff said# they have been cleared as possible suspects## and that "to suggest otherwise# is not only wrong; it is cruel."

But there is some hope that a found glove# may contain DNA from a potential suspect.

Stephanie Sy has more.

STEPHANIE SY: As the search for# Nancy Guthrie enters its third week,## her daughter Savannah made another heartfelt# plea to whoever knows her mom's whereabouts.

SAVANNAH GUTHRIE, Co-Host, "The Today# Show": It is never too late to do the## right thing.

And we are here.

We believe.

STEPHANIE SY: Last week, The Today# Show anchor posted a home video of## her mom captioned: "We will never give up on her."

Authorities continued to chase down leads# after the 84-year-old was reported missing## on February 1.

The FBI said on Sunday that# a glove found two miles from Nancy Guthrie's## house appears to match those worn by the# masked person caught on her porch camera.

Let's just start with the glove.

Is that a major## break in its importance in being# able to potentially find a suspect?

RAY JOHNSON, Retired FBI Special# Agent: I would say it is.

STEPHANIE SY: Ray Johnson is a retired FBI special## agent who now teaches law at the# University of Nevada, Las Vegas.

RAY JOHNSON: The fact that the glove# was within a two-mile radius of the## house and the fact that they were# able to extract DNA from that glove,## taken as a totality and taken# together, that gives me hope.

STEPHANIE SY: Johnson said national# databases could help narrow down a suspect.

RAY JOHNSON: If we can link it together# with somebody who happened to match the## description of the offender or be in the# area or some of the Ring cameras that are## constantly being sought after now for# suspects, that helps us really get what## we need for legal prosecution later and# to get an answer as to what happened.

STEPHANIE SY: It's still not clear what the# motive behind Guthrie's apparent kidnapping## was.

Johnson says certain details# of the case make it untraditional.

RAY JOHNSON: It does not feel to me what a# garden-variety or a kidnapping for ransom## would look like.

In my experience, this# feels more like a premeditated crime,## either a burglary, either a robbery, something# different than a true kidnapping, because,## if you're planning the kidnapping, you're already# going to have those ransom channels set up.

STEPHANIE SY: Law enforcement# is also now reportedly using## a tracking device called a signal# sniffer.

Mounted on a helicopter,## it may be able to detect emissions# from Nancy Guthrie's pacemaker.

Savannah Guthrie's Today Show colleagues# have rallied behind her.

And in a call## with The New York Post today, President# Trump threatened the kidnapper with the## most severe federal consequences if# Nancy Guthrie is not returned safely.

For the "PBS News Hour," I'm Stephanie Sy.