What more evidence have the police collected from the Idaho home where four students were murdered that hasn't been released? Mattresses have been removed from the home, and police are continuing to track down the digital timeline of Bryan Kohberger's whereabouts at the time of the murders.

Phone pings show that Kohberger was in the area of the home at least 12 times in the weeks before the murders, yet his phone was turned off during the suspected murder window. It was turned back on afterward.

The Idaho State Lab is testing trash recovered from the Pennsylvania home of Kohberger's family. The lab "reported that a DNA profile obtained from the trash" matched a tan leather knife sheath found "laying on the bed" of one of the victims.

Forensic experts will be looking at evidence collected at the scene for more DNA matches.

Joining Nancy Grace today:

Dale Carson - High Profile Attorney (Jacksonville), Former FBI Agent, Former Police Officer (Miami-Dade County), Author: "Arrest-Proof Yourself
Dr. Bethany Marshall - Psychoanalyst (Beverly Hills, CA); New Netflix show: 'Bling Empire' (Beverly Hills)
Joe Scott Morgan - Professor of Forensics: Jacksonville State University, Author of 'Blood Beneath My Feet' and host of "Body Bags with Joseph Scott Morgan"
Chris McDonough - Director At the Cold Case Foundation & Former Homicide Detective; Worked over 300 homicides in a 25-year career; Host of YouTube channel, "The Interview Room"
CeCe Moore - Chief Genetic Genealogist, Parabon NanoLabs, Inc.
Laura Ingle-Senior Correspondent, Fox News Channel; Twitter: @laurraingle, Instagram:@lauraingletv

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Could a Single Hair Bolster Case? Idaho Student Murders