Question to the Home Office:

To ask Her Majesty's Government what steps they have taken to establish whether technology is available to distinguish between cannabis being in a driver's system, and that driver being impaired by having taken cannabis within 24 hours of driving; and what conclusions they have drawn.

The Government has developed mobile drug screening technology to support drug driving legislation. Screening devices were first introduced for police use in December 2014. These provide the police with technology to enforce the new offence introduced by the Crime and Courts Act 2013 which made it illegal to drive with one (or more) specified drugs in the body above a specified limit with effect from 2 March 2015. Cannabis is one of the specified drugs.