Inspector Steve Post was speaking from his experience with the Future Music Festival last year, where some revellers were too intoxicated to make it through the gates.
However, he was not expecting similar behaviour this weekend as the Big Day Out attracted a different demographic.
Organisers had told police to expect about 18,000 people, well down on the 35,000 punters who attended the gig at Claremont Showground last year.
‘We’ve heard good reports about the crowds from Big Day Out,’ Insp Post said. ‘It’s a different demographic to that of Future Music’