Detectives face tough questions from John Peros’s legal team at a committal hearing prior to his murder trial. William Daniel and Levii Blackman are witnesses – and Levii denies William told him “I did it”. Frustrated detectives sought answers for the lack of forensic evidence. The lab’s suggestion bacteria may have interfered with DNA testing is “ludicrous”, says forensic scientist Dr Kirsty Wright. Problems with the lab date back years, and Dr Wright believes major changes to software and equipment just weeks before the murder are at the heart of the faults. Vicki and Shannah Blackburn stand with Dr Wright just before the release of this episode, calling for a public inquiry and retesting by another lab of all forensic samples in Shandee’s case as a matter of urgency. A cane farmer finds a blood-stained knife he suspects is linked to the murder, but the lab finds no DNA. Subscribers to The Australian have exclusive first access to episodes of Shandee's Story via The Australian app. Subscribe to The Australian here. You can download on The Australian's app in Apple's store here. Also get it on Google Play here. See omnystudio.com/listener for privacy information.