Testing motorists for drug-driving will begin at midnight tonight, under new legislation.

Drug-driving is a factor in one in ten fatal crashes in Ireland.

Last December, the Oireachtas passed the Road Traffic Act 2016 which paved the way for the drug testing of drivers' saliva both in garda stations and by the roadside.

Drivers can now be tested for four types of drugs - cannabis, cocaine, opiates such as morphine and heroin and benzodiazepines such as valium, sleeping tablets and certain anti-anxiety medication. Read more