Seven dangerous substances containing substances linked to mass-overdoses were identified as part of the second pill testing trial at the Canberra leg of the Groovin the Moo festival.
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The trial tested 171 samples during Sunday's festival, with 234 festivalgoers taking part.
MDMA was identified as the most prominent substance during the trial, with cocaine, ketamine and methamphetamines also being detected.
Seven samples tested in the trial contained n-ethylpentylone, a lethal substance believed to be responsible for several mass-overdoses overseas.
All seven people whose pills contained the substance used the amnesty bin to surrender the drugs.
Organisers of the pill testing trial said the reaction from festivalgoers was positive, with many saying they would reconsider their drug use or take less of it.
The number of pills tested at this year's trial more than doubled compared to last year's event, where 85 pills were tested.
Pill Testing Australia confirmed this year's trial would be the last time the service would be held for free at the event.
The consortium has not approached the ACT government for funding and has said it is investigating several funding models.
Pill Testing Australia's Dr David Caldicott said the data on whether pill testing works would be more than adequate after two trials.
"You could argue quite cogently the healthcare benefits of having a pill testing system, but there are other ways of funding it," Dr Caldicott said.
"This is a health issue and we should be approaching it as such."
Gino Vumbaca from Pill Testing Australia said this year's trial was "non-stop".
"There were a lot more people and we tested a lot more samples," Mr Vumbaca said.
"A number of red flags came up, more than last year although we have tested more samples."