When an Expert Witness Starts Arguing With the Prosecutor

Can an expert witness damage a case by arguing instead of answering questions? In this Tennessee murder trial analysis, I break down the testimony of a defense toxicologist whose courtroom approach may have done more harm than good. In this video, I cover: • Why expert witnesses must answer only the question asked • The difference between confidence and arrogance on the witness stand • How leading questions help control difficult witnesses • Mistakes the prosecutor made during cross-examination • Why some expert testimony can sound more like advocacy than science As retired Missouri attorney Tony DeWitt, I explain the trial tactics, witness-control techniques, and courtroom strategy issues that emerged during testimony in the Blaise Taylor murder trial. If you enjoy trial analysis, criminal law discussions, and real courtroom breakdowns, please like, subscribe, and join the conversation. 0:00 Introduction 0:38 Recap 1:13 Preparing the Experts 2:46 Lawyers Shouldn't Argue With Experts 3:52 Expert Extemporizes on Answer 5:12 Pop Quiz 5:56 Unvalidated Testing 7:02 Good Questions, Bad Follow-up 8:58 When Leading Works 9:44 Distinction Without a Difference 11:44 Lawyer Raises Her Voice 12:49 Advocating Results Not Explaining Science 15:27 Outro