The first mobile drug-testing kit has been approved by the government as part of a crackdown on drug driving.
Called Drugwipe, it is the first portable device that can detect the presence of cannabis and cocaine, two of the most common substances used by drug drivers, by analysing a small quantity of saliva.
Results are indicated by the appearance of lines on the device - similar to a pregnancy test - within eight minutes.
Following a positive reading, the police will take the individual to the police station for a blood sample, which will be used in any subsequent prosecution.
The penalty under the new drug offence will be 12 months disqualification, a fine up to £5,000 and up to six months in prison or both.
Police across Britain will today pay tribute to the officers killed in the terror attack on satirical magazine Charlie Hebdo.
At 10.30am - 24 hours after the shootings in Paris - officers will pause "in solidarity and sympathy".
The request for the show of respect came from the Association of Chief Police Officers (Acpo) and the Police Federation.
Acpo vice president and Greater Manchester Chief Constable Sir Peter Fahy said: "We have to stand together against this threat and we cannot be naive or complacent about how extremist ideologies seek to justify this complete disrespect for human life and for the values which ensure the freedom and welfare of all citizens."
Police cuts are "here to stay" according to Chief Inspector of the Constabulary Sir Tom Winsor.
The head of the police watchdog said there is room for further cuts but acknowledged that the police would have to focus more on serious crime.
His comments contrasted with those of Scotland Yard commissioner Sir Bernard Hogan-Howe, who last month warned of a threat to public safety without radical reform of the police in the face of budget cuts.
Sir Tom said the police need to "work smarter" as inevitably the service will be smaller as he called for more action to tackle cyber crime.
He told BBC Radio 4's The World This Weekend:
The police have already made and done it well in the main, cuts of 20% in the last four years, and they are facing cuts of a further 5% next year.
There will inevitably be a time where they can't take any more but let us remember that measured crime has fallen dramatically but so have the demands made on the police.
In some respects there are further efficiencies to be obtained, that is undoubtedly the case.
They need to work smarter because they will be working smaller.
Association of Chief Police Officers president Sir Hugh Orde also claimed last month that police forces were struggling to deal with reductions in funding.
Police officers have warned that they may have to stop tackling alcohol-fuelled crime if cuts continue at anticipated levels.
Steve White, chair of the Police Federation of England and Wales, said:
Society may have to come up with a different way of dealing with drunken, rowdy behaviour if police officers are also going to be able to deal effectively with counter terrorism, managing sex offenders, cybercrime, child sexual exploitation, looking for missing persons and dealing with people suffering from mental health problems, to name but a few jobs on the list.
Earlier this month, the Government announced a further 5% cut in police funding for 2015/16 amid warnings that government funding is due to be cut further in future years.
Merseyside Police have been granted more time to question a second man suspected of murdering an off-duty police constable.
Pc Neil Doyle, 36, was attacked in Liverpool city centre in the early hours of Friday during a Christmas night out with colleagues.
A 28-year-old man from Huyton was arrested on suspicion of murder later that day and will remain in custody for questioning until tonight.
Today, the force said they have also been granted an extension to continue to question a 30-year-old man from Huyton who was arrested on Saturday.
The Christmas and New Year holiday season will see drivers stopped by police and tested for drugs by the side of the road in a war on drug-driving.
The Telegraph has reported that the Home Office approved roadside testing kits that will analyse samples of saliva instantly to detect illegal substances as well as so-called "legal highs".
It said that police officers will also use the kits to catch drivers who have taken prescription medicines like strong painkillers, sleeping pills and drugs to treat anxiety, that can hinder concentration on the road.
It has been reported that ministers will order police to carry the "drugalyser" kits alongside conventional "breathalysers", which test motorists for alcohol consumption.
A second man has been arrested on suspicion of murdering off-duty police constable Neil Doyle in Liverpool city centre, Merseyside Police has said.
A 30-year-old man from Huyton has been arrested and taken to a police station to be interviewed by detectives.
A 28-year-old man, also from Huyton, who was arrested last night after handing himself into police is still being questioned.
The newlywed wife of a police officer who was killed in an assault in Liverpool city centre while off duty has issued a tribute to him.
Neil was very well loved by all of his family, friends and colleagues and it is a great loss to us all.
We are finding it extremely difficult to come to terms with what has happened and need time to be left to grieve.
The couple got married in July and were due to go on their honeymoon next month.
Police believe three men were involved in the attack on PC Neil Doyle and two of his colleagues in the early hours of Friday and have appealed for witnesses.
A 28-year-old man from Huyton has been arrested on suspicion of murder after handing himself in to a police station.
Detectives are reissuing their appeal for anyone who may have witnessed the assault of three men on Colquitt Street in Liverpool city centre in the early hours of Friday, 19 December, to contact them.
Police believe that three men were involved in the attack on PC Neil Doyle and two of his colleagues at about 3.15am and they are urging anyone who has any information to come forward.
A 28-year-old man from Huyton was arrested on suspicion of the murder of PC Doyle and two section 18 assaults, after he presented himself at a police station last night. He is being interviewed by detectives.
Anyone with information is urged to call the investigation team on 0800 230 0600 or Crimestoppers, anonymously, on 0800 555 111.
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