More than 100 people were arrested for drug offences at the Listen Out music festival in Sydney on Saturday.
About 25,000 dance music fans attended the sold-out event at Centennial Parklands, with police maintaining a heavy presence including officers from the public order and riot squad, dog unit and mounted unit.
Police on Sunday morning said they arrested 116 people for drug possession and that 13 people were charged with drug supply.
A number of other charges were made throughout the day including for dealing in proceeds of crime offences, assault and resisting police.
Three people were taken to hospital with suspected drug overdoses and 116 people were treated at the festival paramedics.
There were also reports that two men suffered suspected drug overdose while travelling to the festival on a party bus.
Drug use and supply has been an ongoing issue for Australian music festivals, just last month 77 people were arrested at the Defqon.1 dance music festival in western Sydney.
There has been a continued push for pill testing at these festivals and earlier this year the organisers of Australian music festival Stereosonic declared support for the initiative after two people died from suspected drug overdoses in 2015 at the festival.
Operation Commander, Superintendent Karen McCarthy, said the safety and wellbeing of revellers was number one priority for police.
"The organisers put together a well-run event and we will continue to work with them in the future to help ensure music-lovers can attend in a safe, drug-free environment," she said.
The visible policing doesn't look like it dampened spirits on the day, going from social media.