There's been a decrease in the number of drug-related arrests at Melbourne's Big Day Out music festival.
A total of 29 people were arrested for drug offences on Friday, down from 40 people at the same festival at the Melbourne Showgrounds last year.
Acting Superintendent Bernie Edwards says only a small number of the 23,000 music fans at the festival were doing the wrong thing.
"We were generally happy with patron behaviour throughout the day, and it looks like most people enjoyed the event," he said.
"It is disappointing that 29 people didn't get the message."
Sniffer dogs were used to find revellers carrying illegal drugs.
Police seized drugs such as ecstasy, amphetamines and cannabis.
Of the 29 arrested, 15 people have been referred to a drug diversion program and 14 have been cautioned.
The Big Day Out heads next to Sydney on Australia Day.