A RANDOM drug testing site at Camperdown netted five drug positive drivers over the long weekend.
Detective Sergeant Cameron Ross, of the Warrnambool police divisional response unit, said a significant number of tests were conducted.
That came after two police drug dogs assisted police busting 20 people with illicit substances at Bookaar's Inner Varnika music/dance festival on Friday.
Sergeant Ross said officers had learnt a lot in the past couple of days, there would be a review and he expected that future music/dance festivals in the region would attract more focused police attention.
"We got three drug positive tests on Monday and an 18-year-old Geelong man was arrested for possessing drugs," he said.
"We'll certainly be looking at how we conduct drug impairment tests and how we exactly set up the drug bus to conduct those tests," he said.
"It's a specialised area and we've experienced a steep learning curve," he said.
On Friday police Operation Huffnpuff targeted drugs at the Darcy Lane festival between noon and 4pm.
The three-day ticketed event is into its third year, is restricted to 1700 people and highlighted alternative/underground music.
About a dozen police were involved in the operation, from the Warrnambool DRU, Corangamite-based uniform officers, the Warrnambool highway patrol unit and two drug squad dogs.
Twenty people were caught with drugs and of those 18 were issued with drug diversions.
A man in his 20s was also found with between 20 and 30 ecstasy tablets and another 20-year-old from the ACT was arrested and remanded in custody.
He was found with one ounce of MDMA split into 50 deal bags and is expected to appear in the Warrnambool Magistrates Court for a bail/remand hearing on Tuesday.
Detective Sergeant Ross said seized drugs included about 100g of cannabis, 100 ecstasy tablets, about 10 grams of speed as well as magic mushrooms and LSD.