Drug and alcohol testing (Workplace drug and alcohol screening and testing)

A test, usually arranged by an employer, that looks for alcohol or drugs in a sample of breath, urine, saliva, blood or hair to support a workplace drug and alcohol policy.

✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review

In short

A test usually shows whether a substance has been used within a window of time; it does not, by itself, prove you were impaired or unsafe at work.
You must give informed consent, and you cannot be physically forced to test — but refusing, where there are fair grounds and a clear policy, can have consequences at work.
A positive screening result should be confirmed by a more accurate laboratory test, with a proper chain of custody, before any decision is made.
Your results are medical information and should be handled confidentially and used supportively, not just punitively, where dependence is found.

A plain-English summary. The detail — including risks and recovery — is below.

At a glance

TypeDiagnostic test arranged for the workplace

AnaestheticNot needed

How long it takesA sample usually takes a few minutes to collect

Hospital stayOutpatient; no hospital stay

Time off workUsually just the appointment

When you'll see resultsBreath alcohol is instant; lab drug results usually take a few days, longer if a positive screen is confirmed

On the NHS?Not an NHS service; arranged privately by an employer, an occupational health provider or for legal reasons

A general guide. Your specialist will give you advice for your situation.

Best fit

Supports safety in roles where being unfit through drugs or alcohol could seriously harm the worker, colleagues or the public.

Pause if

Using a single test as proof that someone was impaired or unsafe at a particular moment, which it cannot show.

Main recovery point

Your sample is collected under a strict procedure. A breath alcohol reading is immediate; a rapid drug screen may give an on-the-spot result.

Good aftercare

Confirmation of non-negative screens by an accurate laboratory method, reviewed by a suitably qualified clinician.

At the appointment

Your sample is collected under a strict procedure. A breath alcohol reading is immediate; a rapid drug screen may...

If the screen is negative

That is usually the end of the process for that test, and the result is recorded and handled confidentially.

If the screen is non-negative

The sample, or a second portion, is sent to a laboratory for a more accurate confirming test before any decision...

Result review

A confirmed result should be reviewed alongside any medicines or medical explanation you gave, ideally by a...

Medical line illustration of an occupational health fitness assessment for Drug and alcohol testing. — Illustration only - not a diagnosis, medical advice or a promise of result. Your anatomy and treatment plan may differ. Vuemedics does not publish before-and-after photos.

What is drug and alcohol testing?

Drug and alcohol testing looks for alcohol or drugs (or the breakdown products they leave behind) in a sample taken from you — usually breath or urine, and sometimes saliva, blood or hair. It is most often arranged by an employer as part of a written drug and alcohol policy, for example before starting a safety-critical job, at random, after an incident, or where there is a specific reason to suspect someone is unfit for work.

It is important to understand what a test can and cannot show. A breath alcohol test gives a reading at that moment. A drug test usually shows that a substance has been used at some point in a window of time — hours to days for most urine tests, or months for hair — but it does not, on its own, prove that you were affected or unsafe at work. As UK guidance puts it, a positive drug test does not by itself mean you were impaired; it is a marker, not proof of intoxication at a given moment.

Testing is not a punishment in itself, and it does not replace a fair conversation. Responsible programmes treat a confirmed problem as a possible health issue — offering support or referral where someone may be dependent — rather than only as grounds for discipline.

This guide explains how testing works, the consent and confidentiality that should protect you, why a positive screening result should be confirmed before any action, and the questions to ask so the process is fair.

Types, options & approaches

There may be different ways to do this. The right approach depends on the clinical question and your circumstances.

Breath alcohol test

A breathalyser estimates the alcohol in your blood at that moment. It is quick, gives an immediate reading, and a positive result can usually be repeated to confirm it on the spot.

Urine drug test

The most common workplace drug test. A first 'screen' gives a rapid positive/negative; any non-negative result should be sent to a laboratory for a more precise confirming test.

Saliva (oral fluid) test

A swab from the mouth. It tends to reflect more recent use than urine and is easier to observe being taken, but detection windows are shorter.

Hair test

Looks back over a much longer period — often months — to give a picture of repeated use over time. It cannot pinpoint a single day or show recent intoxication.

Blood test

Used less often at work, mainly where a precise level at the time of sampling is needed, such as after a serious incident or for legal reasons.

What different tests can and cannot tell you

Test	Looks back over	Mainly shows
Breath alcohol	That moment	Alcohol level now
Saliva	Hours to ~1–2 days	Recent use
Urine	Days (varies by drug)	Recent-ish use
Hair	Weeks to months	Pattern of use over time

Detection windows vary widely by substance, dose and the person. Except for breath alcohol at that moment, a positive result shows use within a window — not that you were impaired or unsafe at a particular time.

Preparing for your test

Ask to see the written drug and alcohol policy and exactly why you are being tested (pre-employment, random, after an incident, or with cause).
Understand what you are consenting to before you give a sample, and ask what happens if you decline.
Tell the collector about prescribed and over-the-counter medicines, as some can affect a screening result and may need to be explained.
Bring identification if asked, as the collector must be sure the sample is genuinely yours.
Ask which substances are being tested for and which type of sample will be taken.
Ask how a positive screening result will be confirmed, and who will see the result.
If you have a health condition or possible dependence, think about whether you want to mention it and ask what support is available.

What happens

For alcohol, you usually breathe into a breathalyser and get an immediate reading. A positive result is normally repeated, sometimes after a short wait, to confirm it.

For drugs, a trained collector takes a sample — most often urine, sometimes saliva, hair or blood — following a strict procedure so the sample cannot be tampered with or mixed up. You will usually be asked to confirm the sample is yours and to sign paperwork. This 'chain of custody' record, tracking the sample from you to the laboratory, is what makes a result defensible if it is ever challenged.

A first screening test gives a rapid result. A negative screen is usually the end of it. A non-negative (positive) screen should not be acted on by itself: the sample, or a second portion of it, should be sent to a laboratory for a more accurate confirming test, and the result should be reviewed in light of any medicines or medical explanation you have given before any decision is made.

Is this test right for me?

A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.

May not be suitable if…

Using a single test as proof that someone was impaired or unsafe at a particular moment, which it cannot show.
Acting on a positive screening result without laboratory confirmation and clinical review.
Testing without a clear, agreed policy and proper informed consent.
Relying on testing to diagnose dependence, which needs a proper clinical assessment instead.
Using testing purely as punishment, with no link to support where a health problem is found.

Delay or rearrange if…

There is no written policy, or you have not been told why you are being tested.
Consent has not been properly explained or obtained.
Chain-of-custody or confirmation arrangements are not in place.
You are acutely unwell, in crisis, or need urgent care rather than a test.
A medical explanation for a possible positive has not been considered.

Alternatives to discuss

A documented for-cause assessment of fitness for work where impairment is suspected, rather than testing alone.
An occupational health assessment to advise on fitness and any health concerns.
Supportive measures, education and management procedures as part of a wider policy.
Referral for addiction assessment and treatment where dependence is suspected.
No testing where there is no clear, proportionate and lawful reason for it.

Before you decide

Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.

What matters most to me?

Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.

What are all my options?

Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.

What would make me pause?

Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.

What happens if I do nothing today?

For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.

Benefits

Supports safety in roles where being unfit through drugs or alcohol could seriously harm the worker, colleagues or the public.
Gives an objective piece of information to support a fair, policy-based process rather than rumour or assumption.
A negative confirmed result can clear up an unfair suspicion.
Can be a route into support, treatment or referral where a problem is identified.
Helps an employer meet its legal duty to protect health and safety at work.

Risks & complications

More common

A screening test can give a false positive — for example through cross-reaction with a medicine or food — which is why confirmation matters.
Worry, embarrassment or feeling mistrusted during the process.
A result may be over-interpreted as proof of being unsafe at work, when it only shows use within a window.
Inconvenience, and the need to explain prescribed medicines.

Less common

An inconclusive or invalid sample that has to be repeated.
A confirmed positive that has consequences at work, including disciplinary action.
Disagreement about whether the sample or process was handled correctly.
A finding that suggests dependence, needing onward assessment and support.

Rare but serious

A breach of confidentiality if results are not handled properly.
A sample mix-up or chain-of-custody failure that undermines a result.
A safety-critical concern that must be acted on quickly to protect others.

The biggest risk is a result being misunderstood. A positive drug test shows use within a detection window, not that you were impaired at a particular moment, and screening tests can be wrong — so a non-negative screen should always be confirmed by a more accurate laboratory test before any action. Ask who collects the sample, how chain of custody is kept, how positives are confirmed, who sees the result, and what support is offered if a problem is found. Note that the Equality Act does not treat alcohol or drug dependency as a protected disability, so honest, supportive handling matters all the more.

Published figures to discuss

There are no procedure complication rates to quote, because this is a test rather than an operation. What matters instead is test accuracy. Rapid screening tests can give false positives (for example through cross-reaction with medicines) and false negatives, and detection windows vary widely by substance, dose and individual. This is why a non-negative screen should be confirmed by a more accurate laboratory method before any action, and why a positive result is treated as a marker of use within a window rather than proof of impairment at a given time.

Figure	Reported range	How to interpret it	Source / confidence
False-positive screening result	Recognised	Rapid screens can cross-react; non-negative results should usually be confirmed by a laboratory method before action.	Guide sourcesClinical context
False-negative result	Recognised	Timing, sample type, detection window, dilution and the substance tested affect results.	Guide sourcesClinical context
Chain-of-custody failure	Major governance risk	Poor identity checks, labelling or sample handling can make results unusable.	HSE — Managing drug and alcohol misuse at work: screening and testinghse.gov.ukSource-linked context
Consent and employment-law misunderstanding	Common	Testing should sit within a clear policy, with confidentiality, consequences and support routes explained.	Guide sourcesClinical context

These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.

What happens afterwards

There is nothing physical to recover from. 'Afterwards' means how the result is produced, confirmed, kept confidential and used — and what support is offered if a problem is found.

At the appointment

Your sample is collected under a strict procedure. A breath alcohol reading is immediate; a rapid drug screen may give an on-the-spot result.

If the screen is negative

That is usually the end of the process for that test, and the result is recorded and handled confidentially.

If the screen is non-negative

The sample, or a second portion, is sent to a laboratory for a more accurate confirming test before any decision is made.

Result review

A confirmed result should be reviewed alongside any medicines or medical explanation you gave, ideally by a suitably qualified clinician, before any action.

If a problem is found

A responsible programme offers support, referral or treatment where dependence is identified, not only disciplinary steps.

What's normal — and not a worry

Giving a sample under observation or strict procedure, which can feel uncomfortable but is normal.
Waiting a few days for a laboratory result, and longer if confirmation is needed.
Being asked to explain any medicines that could affect a screening result.
Hearing nothing further if your confirmed result is negative.

Aftercare

Keep a note of what you were tested for, when, and who took the sample.
Keep evidence of any prescribed medicines that could affect a result.
Ask for your result and how it will be recorded and shared.
If a result is positive, ask whether and how it was confirmed before any action.
If you disagree with a result, ask about re-testing a second portion of the sample.
If a problem is identified, take up any support, occupational health input or treatment offered.
Know who to contact with questions about the process or your result.

Before your test

A copy of the drug and alcohol policy and the reason for testing
A list of prescribed and over-the-counter medicines
Identification if requested
Clear understanding of what you are consenting to
Knowledge of how positives are confirmed and who sees the result
Details of any support available if a problem is found

⚠ Get urgent help if…

Feeling pressured to give a sample without proper consent or any explanation.
A positive screening result being acted on before it has been confirmed by a laboratory.
Being asked to test in a way that does not protect your privacy or the sample's integrity.
Your result being shared more widely than necessary, or without your knowledge.
Withdrawal symptoms, intense cravings or feeling unable to stop — seek medical help.
Thoughts of harming yourself linked to a substance problem — get help now. If it is life-threatening, call 999 or go to A&E. For urgent advice, contact your GP, or use NHS 111 in England, Scotland or Wales; in Northern Ireland, contact your GP out-of-hours service or your HSC Trust's Phone First service.

Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.

General guidance — it doesn't replace the specific advice your specialist gives you.

Results & realistic expectations

A clear result is a confirmed laboratory finding, produced under a proper chain of custody and interpreted in light of any medicines or medical explanation you gave. A confirmed negative can clear up suspicion; a confirmed positive should lead to a fair, policy-based process, not an automatic assumption that you were unsafe at a particular moment.

A test cannot prove impairment at work on its own, cannot read your mind about why a substance was used, and cannot diagnose dependence by itself — that needs a proper clinical assessment. Breath alcohol is the main exception, giving a level at the moment of testing, though even then a policy should set out what level means what.

How long it lasts

A test result reflects only the sample taken at that time and the window it covers, so it quickly becomes out of date — a negative result today says nothing about next week. Where monitoring is agreed, for example as part of a return-to-work plan after treatment, repeat testing over weeks or months may be used to support continued abstinence. Any single result should be seen as a snapshot, not a lasting verdict.

Related tests, treatments or support

Testing is usually one part of a wider drug and alcohol policy that also includes education, support and management procedures. It often sits alongside an occupational health assessment, a fitness-for-work or safety-critical medical, or, where dependence is found, referral for addiction assessment and treatment. The related Vuemedics guides explain those pathways and the supportive role occupational health should play.

Follow-up & long-term care

After a negative confirmed result, there is usually nothing further. After a positive, follow-up should include a fair review of the result, a chance for you to explain, and — where a problem is identified — referral for assessment, support or treatment. Where monitoring is part of a return-to-work agreement, follow-up testing and review are arranged over time.

Keep records of medicines that could affect future tests.
Where monitoring is agreed, attend repeat testing as arranged.
Engage with any support, occupational health or treatment plan offered.
Ask for the policy to be explained again if your role or circumstances change.

Repeat, follow-on and what comes next

A non-negative screening result should be confirmed by a more accurate laboratory test before any decision.
Inconclusive or invalid samples sometimes need to be repeated.
Where you disagree, a second portion of the sample can often be independently re-tested.
A result is a snapshot in time and may need repeating as part of any monitoring arrangement.

Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.

What good aftercare looks like

Confirmation of non-negative screens by an accurate laboratory method, reviewed by a suitably qualified clinician.
Clear, confidential handling of results, shared only with those who need them under the policy.
A fair chance to explain medicines or other reasons before any decision.
A route to re-test a second portion of the sample if you disagree.
Support, occupational health input or referral for treatment where dependence is identified.

What affects the cost

Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:

The type of test used (breath, urine, saliva, blood or hair) and how many substances are screened for.
Whether testing is a one-off or part of an ongoing programme such as random or monitoring testing.
Whether positive screens are confirmed by a laboratory, and the cost of that confirmation.
Whether a qualified clinician reviews and interprets results, including medical explanations.
Where and how samples are collected, including on-site collection or call-out.
Any reporting, record-keeping or chain-of-custody documentation provided.

Make sure your written quote includes

Which samples and substances are included, and the detection windows involved.
Whether laboratory confirmation of positive screens is included and at what cost.
Whether a suitably qualified clinician reviews and interprets results.
How samples are collected and how chain of custody is documented.
How results are reported, to whom, and how confidentiality is protected.
What happens, and any cost, if a result is disputed or a second portion needs re-testing.
What support or referral is available if a problem is identified.

On the NHS? Workplace drug and alcohol testing is not an NHS service; it is arranged privately by employers, occupational health providers or for legal purposes, although the NHS can help with treatment if dependence is found.

You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.

Choosing a specialist safely

Check the specialist is on the GMC Specialist Register for this area.
Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
You're entitled to your total cost in writing — including any follow-up — before you decide.

How Vuemedics verifies every consultant →

Questions to ask your medical professional

Take this to your consultation. A good specialist will welcome every one of these.

Why am I being tested, and what does the policy say about it?
What am I being tested for, and which type of sample will be taken?
How is a positive screening result confirmed before any action is taken?
How is the sample kept secure, and how is chain of custody recorded?
Who will see my result, and how is my confidentiality protected?
If a problem is found, what support or treatment is offered?
Can a second portion of my sample be independently re-tested if I disagree?
Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
Will you be the specialist who carries out my test, and who looks after me afterwards?
What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
What does a realistic result look like — and what can this test not achieve?
What are my options, including waiting, doing nothing for now, or choosing a different approach?
Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
What is the total cost in writing, including any follow-ups, and how much time do I have to decide?

Frequently asked questions

Can my employer force me to take a drug or alcohol test?

No — you must give consent and cannot be physically made to test. But if there is a clear policy and fair grounds for testing, refusing can have consequences at work, including disciplinary action, so it is worth understanding the policy and asking questions first.

Does a positive test mean I was drunk or high at work?

Not by itself. Most drug tests show that a substance was used within a window of time, not that you were affected or unsafe at a particular moment. UK guidance treats a positive test as a marker, not proof of impairment. Breath alcohol is the main exception, giving a level at the time of testing.

Could a prescribed medicine cause a positive result?

A screening test can sometimes react to medicines or even certain foods, which is one reason a positive screen should be confirmed by a more accurate laboratory test. Tell the collector about any prescribed or over-the-counter medicines so your result can be interpreted properly.

What is chain of custody, and why does it matter?

It is the documented trail showing your sample was collected, sealed, transported and tested without being mixed up or tampered with. A proper chain of custody is what makes a result defensible if it is ever challenged.

Who sees my result?

Your result is medical information and should be kept confidential, shared only with those who genuinely need it under the policy and with your consent. Ask who will receive it before you are tested.

What happens if I'm found to have a problem?

A responsible programme treats possible dependence as a health issue, offering support, occupational health input or referral for treatment — not only disciplinary action. Be aware, though, that the Equality Act does not treat drug or alcohol dependency as a protected disability.

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How we made this page

Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →

Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.

Sources & standards: HSE — Managing drug and alcohol misuse at work: screening and testing HSE — Managing drug and alcohol misuse at work (overview) BMA — Alcohol, drugs and the workplace: the role of medical professionals Faculty of Occupational Medicine — Guidance and publications GMC — Confidentiality: disclosing information for employment, insurance and similar purposes nidirect — Urgent and emergency care services (Northern Ireland) nidirect — GP out-of-hours service (Northern Ireland)

Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.

Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.