Kouri Richins Trial Day 4: Brianna Peterson — Deadly Amount? Toxicologist Breaks It Down
True Crime Today | Daily True Crime News & Interviews
Tony Brueski
4.2 • 612 Ratings
🗓️ 26 February 2026
⏱️ 52 minutes
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Summary
Forensic Toxicologist Brianna Peterson takes the stand in this segment of the Kouri Richins trial.
The Kouri Richins murder trial continues in Utah as the state prosecutes the children's book author for allegedly poisoning her husband Eric Richins with fentanyl. Prosecutors allege she killed him for insurance money after secretly increasing his policy to $1.9 million. The defense maintains Eric died from accidental drug use.
True Crime Today delivers real-time trial coverage as it happens—key testimony, critical cross-examinations, and the moments that matter. No waiting for nightly recaps. Watch the case unfold live.
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Transcript
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| 0:00.0 | You're listening to continuing coverage from the trial of Corey Ridgians from the |
| 0:05.0 | Hidden Killers podcast and True Crime Today. |
| 0:08.4 | Now, back to the courtroom. |
| 0:11.4 | Hello, Dr. |
| 0:12.4 | Can you please state your full name and spell your last name for the record? |
| 0:17.0 | Brianna Lynn Peterson, P-E-T-E-R-S.O.N. Are you employed, ma'am? Yes. How are you employed? I'm a forensic toxicologist with NMS labs. |
| 0:29.8 | How long have you been a forensic toxicologist? Over 20 years. |
| 0:35.4 | And with NMS? I've been with NMS since June of 2021. |
| 0:41.3 | Okay. So you were working there in March of 2022? |
| 0:46.3 | Correct. |
| 0:47.3 | Okay. |
| 0:48.3 | What is a forensic toxicologist? |
| 0:51.3 | Forensic toxicology, you analyze biological samples for the presence or absence of drugs and alcohol. |
| 1:00.0 | And what is your education briefly? |
| 1:04.0 | I received my bachelor's degree in chemistry from the University of Wisconsin-Lacross in 1997, a master's degree in forensic |
| 1:13.3 | science from the University of Illinois at Chicago in 1999 and a PhD in toxicology from |
| 1:20.9 | the University of Georgia in 2007. |
| 1:25.7 | Since becoming a forensic toxicologist 20 years ago, have you had training, continuous training? |
| 1:34.7 | Yes. |
| 1:35.3 | So throughout my career, I've received training specific to the chemical extractions that are to be performed on the biological samples, the instrumentation that's used for the analysis, |
| 1:46.0 | and then also pharmacology for the interpretation of the drug and ethanol results, |
| 1:52.0 | and how they might apply to either impairment or a medical legal death investigation. |
... |
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