A 22-year-old man is dead and two others are in hospital after taking an 'unknown substance' at the Lost Paradise Music Festival on the NSW Central Coast on 29 December.
NSW Police said some people have tried to smuggle drugs into the event through so-called "sophisticated" methods, including compartments within Vegemite jars and inside the stuffing of a barbecue chicken.
Human Movement performing at the Lost Paradise Music Festival.
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More than 180 people and 97 vehicles have been searched during the festival's police operation, while three people have been charged with drug supply offences.
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Police issue warning to festival-goers
NSW Police Force Acting Superintendent Rod Peet said people are not getting the message.
"You can talk about alternatives and testing and things like that. The best message I can give you is don't take illicit drugs.