Defense in Derek Chauvin case raises questions over George Floyd's drug use

ABC News' Alex Perez has the latest on the trial, new forensic evidence and dramatic audio played in court of what George Floyd said before he lost consciousness.
2:32 | 04/08/21

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Transcript for Defense in Derek Chauvin case raises questions over George Floyd's drug use
Now to the latest in the trial of Derek chauvin. That dramatic audio of George Floyd playing out in court and the moments right before he lost consciousness. The defense also raising questions about drug use based on new forensic evidence. Alex Perez is at the courthouse in Minneapolis. Good morning, Alex. Reporter: Hey, good morning, Michael. A lot of legal sparring happening here in court. The prosecution trying to get ahead of the defense who's arguing it was drugs and health problems that killed George Floyd. Forensic investigators testifying as prosecutors show the jury images of items recovered from the scene, their initial report did not include pills later found in the backseat of the police squad car and in the center console of Floyd's vehicle. Tests confirming those pills contain methamphetamine and fentanyl and arguing Floyd spit them out in his tussle with police. The swab collected from that pill I contained a single source male DNA profile that matches George Floyd. Reporter: Chauvin's lawyer trying to use the match to bolster their claim it was the drugs in Floyd's system that killed him. The defense also zeroing in on some of George Floyd's last words while chauvin was pinning him down and plying this clip from body cam video for the state's lead investigator, special agent James reyerson. Did you hear that? Yes, I did. Did it appear Mr. Floyd said, I ate too many drugs? Yes, it did. Reporter: But the prosecutor not buying the argument playing an earlier more extended portion of that same tape for the investigator who then had a different answer. Having heard it in context, are you able to tell what Mr. Floyd was saying there. Yes, I believe Mr. Floyd was saying I ain't do no drugs. Reporter: 11 current an former members of law enforcement have now testified against chauvin including use of force expert LAPD sergeant Jody Steiger who reviewed all videos and determined Floyd posed no threat once he was handcuffed and on the ground telling jurors chauvin should have reduced You could see that Mr. Floyd's -- his health was deteriorating, therefore, you have responsibility to take some type of action. Reporter: And we could learn today if the man who was in the car with George Floyd when the incident began will testify. He threatened to invoke fifth amendment rights. The judge expected to hear more on this later this morning.

This transcript has been automatically generated and may not be 100% accurate.

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