SAVANNAH GUTHRIE'S MOM MISSING: DAY 59

Investigators are focusing on electricians, HVAC workers, and roofers who had legitimate access to Nancy Guthrie's home in the weeks leading up to her disappearance. These individuals are now being tracked and subjected to DNA collection via buccal swabs, a standard procedure for comparison against any forensic evidence found.

Matt, an investigative reporter, states that 'a number of individuals that had legitimate access to Nancy Guthri's home' including electricians and HVAC workers 'are now being tracked back by investigators.' Susanna Ryan, a forensic DNA analyst, confirms buccal swabs are a simple, non-intrusive method for DNA collection and notes past cases where construction workers with legitimate access were perpetrators.

Blood evidence found outside Nancy Guthrie's front door is being compared to the distinctive tread patterns of Ozark Trail shoes. This brand is significant as an Ozark Trail backpack and holster were previously mentioned in the investigation. Forensic experts believe digital enhancement of surveillance footage could identify specific branding and wear patterns unique to an individual.

Joe Scott Morgan, a forensics investigator, discusses comparing the tread pattern of Ozark Trail shoes to blood found outside the front door. He explains that shoe wear patterns are distinctive and that FBI digital enhancement can identify branding and specific identifiers on shoes seen in video footage.

A gray or silver SUV or pickup truck has been identified as a vehicle of interest. Investigators believe this vehicle could be a secondary crime scene, potentially containing Nancy Guthrie's blood and the perpetrator's DNA, even if the vehicle was stolen or efforts were made to clean it.

Dave Mack reports that investigators have narrowed down vehicles of interest to a white van and a gray or silver SUV or pickup truck. Susanna Ryan emphasizes that finding such a vehicle would be 'very useful' as it would likely contain Nancy's blood and the suspect's DNA on surfaces like the steering wheel, gear shift, or door.

Forensic experts express significant concern that initial crime scene investigators may have mishandled or overlooked crucial evidence, specifically blood on an interior rug near the front door. This oversight could compromise the integrity of the evidence and be exploited by defense attorneys.

Joe Scott Morgan criticizes the initial handling, stating, 'they didn't collect it in the moment' regarding a rug with potential blood. He warns that 'once you do not secure the scene, then all bets are off' and lawyers could argue evidence was planted or altered, calling it 'a train wreck.'