Australians spent about $9.3 billion last year on cocaine, meth, MDMA and heroin, according to an examination of sewer water.
The Australian Criminal Intelligence Commission's latest analysis of wastewater, released on Wednesday, shows how much of each of the drugs are being consumed around the country, underlining the size of the drugs black market.
The commission estimates more than 9.6 tonnes of methylamphetamine was consumed in Australia in the year to August 2018, along with four tonnes of cocaine, 1.1 tonnes of MDMA, and more than 700 kilograms of heroin.
