New rules about taking drugs and driving will come into force in England and Wales on 2 March 2015 in an effort to cut the estimated 200 drug driving-related deaths in the UK each year.
It is already illegal to drive while impaired by drugs, but the additional legislation means that police can stop drivers and test their blood levels of 16 substances, including medicines such as benzodiazepines and morphine. In total, the UK Department for Transport estimates the move will affect around 19 million prescriptions a year.