Jetstar has confirmed a crew member warned passengers returning from a music festival about drug-detection dogs waiting at Sydney airport.
Passengers were advised to flush away anything they should not have, prompting a rush for the toilets, the ABC reported.
Some of those on board were returning home from the the Splendour In The Grass festival at Byron Bay.
In a statement, the airline has apologised to passengers and said the issue was being addressed with the cabin crew member concerned.