People who drive while under the influence of drugs are being targeted by a new West Midlands Police campaign.
The force said illegal substances were a factor in one eighth of all road fatalities involving men aged under 24.
During a 2006 summer drink-drive campaign, 14% of those drug-tested tested positive for class A substances.
Patrols will stop drivers and carry out field-impairment tests at the roadside to check that they are fit to drive, as part of the four-week campaign.
Pc Steve Rogers, of the force's road policing unit, said: "We want to raise awareness of the fact that people who take drugs and drive will be caught.
"Our message is that if you are a drug user and think you can get away with it, think again."