Drug-drivers 'get away with it,' police warn
29 November 2013 Last updated at 12:06 GMT
Drug-drivers are getting away with being intoxicated behind the wheel because it is difficult to prove, police have warned.
Currently officers have to prove drugs have impaired someone's ability to drive in order to charge them, and in 2011 41% of 2,700 cases of drug-driving were withdrawn or dismissed.
BBC Radio 5 live's Victoria Derbyshire reporter Rowan Bridge met with Humberside police to find out how they go about catching drug-drivers.
One officer, PC Dave Stevenson, told him: "They effectively get away with it... because we have no way of determining that level of intoxication from drugs."