Five days of testimony in the Kouri Richins murder trial have produced a credibility war. The prosecution's star witness claims she bought fentanyl for Kouri four times. The defense has exposed her meth use, her immunity deals, and her supplier's reversal. Kouri has maintained composure through it all. Former FBI behavioral analyst Robin Dreeke breaks down who's telling the truth — and how to know.

Dreeke served 21 years with the Bureau, including as Chief of the Counterintelligence Behavioral Analysis Program. Reading people in high-stakes environments was his specialty. He understands what behavioral signals indicate reliability despite credibility problems — and what signals indicate performance.

Carmen Lauber is the prosecution's key witness. She testified she obtained fentanyl for Kouri multiple times before Eric Richins died. But she was using methamphetamine during the relevant period. She received immunity from Summit County, Salt Lake County, and the federal government. Her own supplier, Robert Crozier, originally told detectives he sold fentanyl — but testified Friday it was oxycodone, blaming his original statement on being "detoxing and out of it."

The defense is hammering every inconsistency. The prosecution needs the jury to believe her anyway. Dreeke explains how to assess whether a witness like Lauber is telling the truth despite the baggage — versus constructing a narrative that serves her immunity deal.

He also reads Kouri's behavior. Nearly four years of maintaining innocence through investigation, arrest, hearings, and now trial. Sustained composure through testimony describing how she allegedly murdered her husband. What does that level of performance require psychologically — and where do the cracks show?

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