Following a major decade-long study released in early 2025 and 2026, Adjunct Associate Professor Dimitri Gerostamoulos (Chief Toxicologist at the Victorian Institute of Forensic Medicine) highlighted a shift in Australian road trauma: drug-driving is now a more frequent factor in serious crashes than alcohol.

The "1 in 4" figure you mentioned—specifically around 23% to 25%—refers to the prevalence of illicit drugs found in the systems of drivers involved in serious or fatal accidents.

He joined John Stanley to discuss the findings.