Both had deals with prosecutors. Both were supposed to build the drug chain that ends with fentanyl in Eric Richins' Moscow mule. And they directly contradicted each other on the most critical question: was it fentanyl, or was it oxycodone?

Retired FBI Special Agent Jennifer Coffindaffer breaks down exactly what happens to a prosecution when its two key immunity witnesses tell different stories about the same transaction — and why this isn't just a credibility problem. It is a chain-of-custody problem for the drug at the foundation of the entire case.

Coffindaffer explains how FBI investigators typically handle witness contradiction of this magnitude, what options prosecutors have to shore up a chain that's already been undermined from inside their own courtroom, and how juries process the reality that both witnesses on the stand received deals that reduced their personal liability before agreeing to testify.

She also breaks down Josh Grossman's testimony — Kouri's alleged boyfriend, visibly emotional at the stand, head in hands as intimate text messages were read aloud, including one asking whether he would marry her if she were divorced right now, sent less than a month before Eric's death. Coffindaffer explains what FBI investigators watch for in a witness's emotional performance — and what that testimony does for the prosecution's narrative of motive.

She also gives her read on the back-to-back mistrial motions: deliberate appellate strategy, or genuine concern about what is still coming?

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