The Tories are demanding Scotland catches up with the rest of the UK in preventing deaths caused by drug-driving.
Ruth Davidson’s party is calling for the SNP administration to bring in tougher laws based around roadside testing.
In Scotland, there are no criminal limits for drugs, or a widespread system for screening on the scene, although both measures are in place in England and Wales.
If adopted, as demanded by the Scottish Conservatives, officers and prosecutors in Scotland would no longer have to prove a motorist was impaired to drive – only that they had an illegal amount of drugs in their system.
Douglas Ross, for the Tories, said the SNP “needs to take action without further delay” after failing to tackle “this menace on our roads”.
A Scottish Government spokeswoman said: “We are considering very carefully whether evidence shows that specific drug driving limits should be introduced in Scotland.”
A Transport Scotland study revealed that a driver being impaired by drugs was “possibly or very likely to be a contributory factor in 55 road accidents in 2015”.
Tougher laws needed to deal with drug-driving ‘menace’, say Scottish Conservatives