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New regulations aimed at stopping people driving while on drugs have come into force in England and Wales.

Motorists face prosecution if they exceed limits set for the presence of eight illegal drugs, including cannabis and cocaine.

Natalie Grove, whose daughter Lillian was killed by a driver high on cannabis when she was 14, told the programme drug drivers are a big problem.

"This is a much bigger problem than we realise they've been able to get away with it for so long," she said.

"I'm really pleased, and it's mainly what Lillian has made us achieve in memory of her...our main aim was always to set out and catch these criminals and protect others," she added.

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