Key Witnesses Expert Witnesses Prosecution Cross-Examinations Criminal Charges Criminal Cases Defense Strategies Potential Witnesses Michael Cohen Testimony Cohen's Testimony Hush Money Payments David Pecker Testimony FBI Forensic Chemist Cross-Examination Nicholas LeFleur Witness Statements Educational Policies Informants Testimony Discrepancies Subpoenas Prosecution Witnesses Legal Defense Defense Arguments Witness Credibility Campaign Finance Violations Trial Proceedings Impact of Tapes Extortion Schemes Attorneys Stormy Daniels Testimony Credibility Issues Evidence Admission Technical Aspects Mistrial Attempts Expert Witness Testimony Trial Dynamics Trial Evidence Witnesses Criminal Intent Robert Costello Email Evidence Jury Instructions Michael Cohen