After being arrested for drink driving, how did a hair sample and forensic expertise help save Silverchair lead singer Daniel Johns from a prison sentence?

Dr Michael Robertson has over 20 years of forensic expertise. One of his most common cases is drink driving, and even though it seems black and white - you're either over the limit or you're not, it's actually far more nuanced and complex.

Join host Kathryn Fox as she unpacks Michael's work and the case involving Daniel Johns.

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