"What we need is the sensible application of police discretion rather than having drug dogs at the front of music festivals scaring often inexperienced drug users into having panicked ingestions", he said.
A total of 355 drug searches were conducted with 69 people found to be in possession of drugs, including the 10 charged with supply offences.
It's understood ambulance officers arrived at the festival to find at least four people in critical conditions.
"I'm absolutely aghast at what has occurred, I don't want any family to go through the tragedy that some families are waking up to this morning, it's just frightful to think about", the premier of the Australian state of New South Wales, Gladys Berejiklian, said.
Today the organisers said they were "deeply saddened" by the deaths.
Member for Penrith Stuart Ayres confirmed that the Sydney International Regatta Centre, which was the location the festival, will "not be hosting Defqon.1 into the future".
Of the 25,000 festival-goers who are said to have attended the event on Saturday, police said as many as 700 of them sought help from medical staff on site.
"We want to make you aware that the use of illicit substances carries a range of health risks including the possibility of death, and is strictly forbidden at this event".
A 26-year-old woman from Jamisontown remains there in critical condition, while a 19-year-old Artarmon man is in Westmead Hospital in intensive care.
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Australian Medical Association president Tony Bartone says law enforcement can't be the sole strategy when it comes to dealing with illicit drugs.
In 2013 and 2015, two men in their 20s died while attending the festival, both of suspected drug overdose.
Drug testers said they found the "absolutely lethal" N-Ethylpentylone (ephylone) which is responsible for deaths around the world.
More than a dozen people were reportedly treated at hospital.
'We are disappointed at the number of reported drug-related incidents.
Detectives have set up a dedicated strike force, dubbed Highworth, to investigate the latest two deaths.
NSW Greens politician David Shoebridge hit out at the state government for failing to facilitate pill testing at last night's music festival. Festival organisers are working closely and cooperating with the authorities regarding the fatalities and the number of medical presentations made during the evening, a full investigation is now underway.
A 33-year-old man from Mt Pritchard was also charged with supplying a commercial quantity of a prohibited drug after he was allegedly found with MDMA, while a 27-year-old man from Sydney was charged with supplying a commercial quantity of a prohibited drug.