Your impression from the document that you read was that the major issue at trial was the credibility of Dr. Babrauskas vs. David Campbell. This isn’t accurate. It is true that Dr. Babrauska’s testimony fell flat because he had had absolutely no experience or exposure to fires or burned structures outside the controlled environment of a laboratory. The complaint that the prosecutor badgered him is odd, as that's what defense attorneys and prosecutors do. If the defense didn’t badger Mr. Campbell about his credentials (are you sure about that?) it was likely a strategic move, as his resume was impressive & it would have appeared that they were grasping at straws. There were many other data points during the seven 35-hour weeks of the trial of that were just as significant (some more so) than the testimony of Dr. Babrauskas and Mr. Campbell. (As one juror said in an interview, it was the “totality of the evidence” that led to Ms. Welton’s conviction.)