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They Kept the Perpetrator's DNA! #truecrime #crimejunkie

August 30, 2025 / 00:45

This episode discusses DNA phenotyping, Lieutenant Co's investigation techniques, and a case from May 2018 involving the Carl'sbad Police Department.

Lieutenant Co examines a case where the offender's DNA was present at the crime scene but led to no suspects. He reflects on the challenges faced in identifying the perpetrator.

In May 2018, the lab that conducted the initial DNA phenotyping for a previous case informs the Carl'sbad PD that they still have the offender's DNA on file. They offer to evaluate it using a new method called IGG.

This conversation highlights the importance of evolving forensic techniques in solving cold cases and the role of law enforcement in adapting to new technologies.

TLDR

Lieutenant Co investigates a cold case using updated DNA phenotyping techniques in 2018.

Episode

0:45

00:00:00

So when Lieutenant Co sees this, this gets his gears spinning. Forget turning. They are like almost smoking, right?

00:00:07

Like here he is working on another case where the offender's DNA is all over the

00:00:12

crime scene and a full profile is in Cotus, but they just keep striking out. So Coz starts doing his homework trying

00:00:19

to figure out if he could make use of the same techniques. And it just so happens that around the same time, this

00:00:26

is May of 2018, the lab that did the initial phenotyping for Jod's case comes back to Carl'sbad PD and basically says

00:00:33

like, "Hey, by the way, we've still got your offender's DNA on file from that test that we did last year. Do you want

00:00:40

us to evaluate it using IGG?" >> Uh, yes, please. Yes, please.

Episode Highlights

Breakthrough in DNA Analysis
The lab offers to re-evaluate the offender's DNA using new techniques.
“Hey, by the way, we've still got your offender's DNA on file.”
@ 00m 33s
August 30, 2025

Episode Quotes

Uh, yes, please. Yes, please.
They Kept the Perpetrator's DNA! #truecrime #crimejunkie

Key Moments

Phenotyping Techniques00:26
DNA Breakthrough00:40