In opening statements at the beginning of the week, one of Matthew Tornquist’s attorneys said the defendant has no obligation to prove himself not guilty, and the defense can be accomplished with effective cross-examination of the state’s witnesses. That cross-examination strategy came into play Thursday, when DCI Special Supervisory Investigator Pat West answered defense questions about flaws in the investigation. Tornquist is standing trial in Rapid City for the murder of his mother, who disappeared almost three years ago. SDPB’s Victoria Wicks has this report.