The prosecution has been a bit of a train wreck so far. The emotional testimonies from the bystanders were effective, but don’t really speak to the facts of the case. Most of the witnesses who gave substantive testimony were forced to concede key defense positions (e.g., that the lack of oxygen could have been caused by drugs or preexisting conditions, that Chauvin looks to have had kneeled on Floyd’s back and not his neck in the body cam, that a hostile crowd should be factored in to how to treat a suspect and that the crowd was, in fact, hostile, that police procedures allowed the restraint and that the restraint used could be warranted in this situation).
Dr. Tobin’s testimony seems to help the prosecution, but the fact that it was so absolute and contradictory to the testimony of other prosecution witnesses should boomerang on the prosecution’s case. The defense will probably move to end the trial as a matter of law at the conclusion of the prosecution’s case, and while there is no chance of this succeeding in this political environment, based on what I’ve seen it probably should.
To anyone swayed by media accounts of this trial, I highly recommend watching the trial footage itself, without the lense through which the media is presenting the information.