The Northern Grampians Highway Patrol said roughly one in two drivers tested positive for drugs like cannabis or methamphetamines.
Acting Sergeant Shaun Allen said they were disappointed in the results.
“They’re certainly over-represented now in our statistics and especially in relation to serious collisions, we’re finding that more and more are positive in regards to drugs,” he said.
He is urging people not to get behind the wheel if they have been using drugs.
“We random drug test drivers and if they become positive with our tests, they get sent away for a proper laboratory test and then if it comes back then we prosecute on that,” he said.
“There’s no level with drugs, you’ve either got them in your system or you haven’t.”
Source: http://www.abc.net.au/ Feb.2015