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That's where I'm a little confused. As I understand it, one of the defense witnesses brought up this particular bit of evidence, saying that Floyd may have died from carbon monoxide from the tailpipe of the vehicle he was laying behind. I don't understand why the prosecution isn't allowed to have a witness rebut that testimony.
I fully understand that the prosecution isn't allowed to present new evidence on redirect, but I would think they would be allowed to address something specific that a defense witness testified to.
Apparently it was because the prosecution had not offered that rebuttal evidence in time, according to the judge. There are pretty strict rules about how experts testify and are rebutted. Apparently the tailpipe testimony was noted in the pre-trial filings and the prosecution did not state its intention to rebut it. During the trial the coroner’s office notified the prosecution that they had checked carbon monoxide levels in Floyd’s blood - but the judge ruled that this rebuttal evidence had not been properly prepared and was therefore inadmissible. He instructed the prosecution not to elicit that testimony on the stand.