In the past six months, police have drug tested 22,473 drivers across the state, with 336 returning a positive result.

Almost a third of the positive drivers were detected in rural Victoria.

Figures for Ballarat were unavailable, yesterday.

Ballarat Police Service Area manager Inspector Bruce Thomas said drug driving could be just as deadly as speeding or drink driving.

"It is very dangerous and it increases the crash risk rate, very much the same," he said.

"Any statistics that show people are driving with drugs in their system worry me."

It's been five-and-a-half years since Victoria Police's random drug testing program began, with more than 122,000 drivers tested for drugs. Almost 2000 have tested positive.

Speed is the drug of choice, with 83 per cent of those caught testing positive to that drug.

Cannabis was the second highest detected drug (29 per cent) and MDMA or ecstasy the third highest (15 per cent).

Inspector Thomas said members of the Ballarat Highway Patrol were doing their best to combat the issue.

"From looking at the statistics it would appear the problem is Victoria wide and Ballarat isn't immune from drug driving," he said.

"I'm sure there are people driving with drugs in their system around Ballarat and we will implement measures to combat that."

Victoria was the first jurisdiction in the world to begin testing drivers randomly for illicit drug use.

Inspector Thomas said country drivers with the attitude that they won't get caught were wrong.

"That's a naive attitude, because they don't know where we're going to be, we could be waiting around the corner," he said.

"It's an irresponsible attitude to take."

Victoria Police's drug testing program continues to expand across the state, and motorists can expect to be drug tested by Double-Trouble buses or police cars - marked or unmarked.