A family whose teenage daughter was killed by a speeding driver who had taken drugs are hoping their campaign for tougher drug driving laws may have paid off.
Lillian Groves was only 14 when she was knocked down while playing outside her home in Surrey in June 2010.
Since then, her relatives have campaigned for a "Lillian's Law" to allow police to carry out roadside drug testing.
Now it is understood a new drug driving offence could be included in next month's Queen's Speech .
Lillian's mother Natasha Groves said drug testing "should be done at the scene of an accident. The same as it is for drink driving".
The teenager's aunt Michaela Groves said: "It should be as simple as the breathalyser was for drink. Zero tolerance is what we as a family think is the only way you can look at it.
"As in drink they have set a threshold and there's a limit, that you are either under or over. We've looked at some of the drugs that they want to test for and we don't seriously feel that you can indicate a level on certain drugs.
"It should be zero tolerance. It makes it clear for everybody that if you want to take drugs...don't get behind the wheel of a car."
The motorist who hit Lillian was tested nine hours after the crash and only after he said he had been smoking cannabis earlier in the day.
While small traces were found in his system, it was not a factor included in the charges against him. He was eventually given an eight-month sentence and served eight weeks in jail.
A panel of experts has also been looking into the issue for the Government.
Road safety minister Mike Penning said: "Drug drivers are a menace which is why we are going to introduce a new drug driving offence and approve screening equipment to make it easier for the police to test for the presence of drugs in drivers and tackle this irresponsible minority."
While roadside testing equipment is made in the UK, you won't find it used on Britain's roadsides.
The Association of Chief Police Officers say a change in the law is needed before that is a practical option.
In a statement they told Sky News: "The existing legislation requires the police to prove impairment rather than just the fact that a person has a certain level of a drug in their body, so at this time the roadside drug testing kits are of little use.
"If and when legislation is introduced that mirrors the drink driving legislation....these devices will become a great asset in policing drug driving."
A meeting with the Prime Minister has given the family some hope that a law in Lillian's name could become a lasting legacy for their little girl.
Today as part of their campaign the family will visit a company that manufactures drug testing equipment.