"So I was honest and said the last time I did it was April, so it was a while ago, but I was honest with them," she told the photographer after he saw her speaking to police.

She claims she was also asked if she had been around people taking drugs before arriving at the event at Olympic Park in Sydney's west.

"I was at my mate's place but that's about it. I know they bender but other than that, no. I mean I've worn these shoes to other events," she said.

Ms Korfiatis, from Roselands, said she was not aware of what substances she was being tested for.

"I had a Vicks stick. So the Vicks stick saw me being considered a druggo," she said.

Ms Korfiatis then spoke to the licensee who she claims denied her entry as she disclosed her previous drug use and presented the tube of nasal decongestant she was carrying.

"I spoke to the licensee who said, 'You've been honest and you've said you've done drugs in the past and you've got the Vicks stick and the dog has identified you as positive so we're not letting you in,' " she told the photographer.

"You have no idea how long I've been looking forward to this. I bought the tickets on pre-sale about six months ago."

She was the only member of her group who was denied entry to the $130 a head event.

New rules implemented by NSW Police earlier in the week stated that, should a drug detection dog sit next to any reveller, they would be turned away or ejected from the event – even if drugs were not found.

Police also ordered opponents of the hard-line approach to stop distributing flyers, which contained information about the detection dog program and advice to anyone pulled aside by police.

About 30 volunteers from the "Sniff Off" campaign, backed by the NSW Greens, descended on Olympic Park to distribute the flyers to concertgoers.

The Sydney Olympic Park Authority Regulation 2012 declares a person within its bounds must not "distribute a brochure, leaflet or handbill".

The group from "Sniff Off" said it had spoken with ticket holders who were denied entry even though no drugs were found on them.

"This is a serious abuse of police powers," they posted on Facebook.

"We will see the NSW Police Force in court next week."

When approached for comment on Saturday night, a NSW Police spokesperson told Fairfax Media there was "nothing to report, positive or otherwise".

Ms Korfiatis could not be contacted for further comment on Saturday night.

With Brook Mitchell and AAP