Hair holds personal diary of drug-taking

THE LENGTH of your hair not only offers a fashion statement - it can also reveal whether you are a drug addict.

Last week, Europe's first commercial testing service to detect whether a person has been taking drugs by analysing hair opened in Britain.

Unlike urine samples, which detect substances taken in the last 48 hours, hair can reveal whether someone has been taking drugs in the past weeks and even months. It can also distinguish different types of narcotics and when they were taken.

Hair is made from cells which divide and mix with blood at the base of each follicle. Any drugs that are in the blood supply are trapped in the centre of the strand.

Scientists dissolve the hair samples and analyse them for traces of the drug's breakdown products. On average hair will grow at about 1cm a month, providing a personal drugs diary.

The technique has been available in the United States for several years, where it has been used to monitor and treat addicts on drug rehabilitation programmes.

It is also used by companies to detect drug abuse in employees or prospective employees. Some British firms have also used this method to vet their staff.

Supporters of the technique say it is much harder to evade - drug-abusers have been known to give old urine samples from bottles hidden on their body - is more accurate than urine samples, and is easy to collect.

The disadvantages are that some of the drugs can be washed out of hair with regular shampooing and about 15 per cent of a person's hair will stop growing at any one time, giving an old reading.

Future applications are expected to include tests in sport. The new clinic, Tricho-Tech, based at the Cardiff Medicentre, plans to offer analysis for a wide range of drugs, including cocaine, ecstasy and barbiturates. The technique was developed in the United States in the 1980s.

Suggested Topics
Start your day with The Independent, sign up for daily news emails
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Ashdown Group: Senior VMware Platform Engineer - VMware / SAN / Tier3 DC

£45000 - £55000 per annum + benefits: Ashdown Group: Senior VMware Platform En...

Recruitment Genius: Purchasing Assistant

£10000 - £16000 per annum: Recruitment Genius: A distributor of specialist ele...

Recruitment Genius: Sales Ledger Assistant

£17000 - £19000 per annum: Recruitment Genius: A distributor of specialist ele...

Ashdown Group: Automated Tester / Test Analyst - .Net / SQL - Cheshire

£32000 per annum + pension, healthcare & 23 days holiday: Ashdown Group: A gro...

Day In a Page

War with Isis: Iraq's government fights to win back Tikrit from militants - but then what?

Baghdad fights to win back Tikrit from Isis – but then what?

Patrick Cockburn reports from Kirkuk on a conflict which sectarianism has made intractable
Living with Alzheimer's: What is it really like to be diagnosed with early-onset dementia?

What is it like to live with Alzheimer's?

Depicting early-onset Alzheimer's, the film 'Still Alice' had a profound effect on Joy Watson, who lives with the illness. She tells Kate Hilpern how she's coped with the diagnosis
The Internet of Things: Meet the British salesman who gave real-world items a virtual life

Setting in motion the Internet of Things

British salesman Kevin Ashton gave real-world items a virtual life
Election 2015: Latest polling reveals Tories and Labour on course to win the same number of seats - with the SNP holding the balance of power

Election 2015: A dead heat between Mr Bean and Dick Dastardly!

Lord Ashcroft reveals latest polling – and which character voters associate with each leader
Audiences queue up for 'true stories told live' as cult competition The Moth goes global

Cult competition The Moth goes global

The non-profit 'slam storytelling' competition was founded in 1997 by the novelist George Dawes Green and has seen Malcolm Gladwell, Salman Rushdie and Molly Ringwald all take their turn at the mic
Pakistani women come out fighting: A hard-hitting play focuses on female Muslim boxers

Pakistani women come out fighting

Hard-hitting new play 'No Guts, No Heart, No Glory' focuses on female Muslim boxers
Leonora Carrington transcended her stolid background to become an avant garde star

Surreal deal: Leonora Carrington

The artist transcended her stolid background to become an avant garde star
LGBT History Month: Pupils discuss topics from Sappho to same-sex marriage

Education: LGBT History Month

Pupils have been discussing topics from Sappho to same-sex marriage
11 best gel eyeliners

Go bold this season: 11 best gel eyeliners

Use an ink pot eyeliner to go bold on the eyes with this season's feline flicked winged liner
Cricket World Cup 2015: Tournament runs riot to make the event more hit than miss...

Cricket World Cup runs riot to make the event more hit than miss...

The tournament has reached its halfway mark and scores of 300 and amazing catches abound. One thing never changes, though – everyone loves beating England
Katarina Johnson-Thompson: Heptathlete ready to jump at first major title

Katarina Johnson-Thompson: Ready to jump at first major title

After her 2014 was ruined by injury, 21-year-old Briton is leading pentathlete going into this week’s European Indoors. Now she intends to turn form into gold
Syrian conflict is the world's first 'climate change war', say scientists, but it won't be the last one

Climate change key in Syrian conflict

And it will trigger more war in future
How I outwitted the Gestapo

How I outwitted the Gestapo

My life as a Jew in wartime Berlin
The nation's favourite animal revealed

The nation's favourite animal revealed

Women like cuddly creatures whilst men like creepy-crawlies
Is this the way to get young people to vote?

Getting young people to vote

From #VOTESELFISH to Bite the Ballot