A bit about us…

OdiliaClark was founded in 2018 to address the increasing demand for high quality, independent of laboratory impairment management services. OdiliaClark provides bespoke workplace drug and alcohol testing services inclusive of workforce training and policy development all under pinned with services to support staff if required. OdiliaClark has partnered with Draeger, the global leader in impairment detection equipment as used by law enforcement in over 80 countries to ensure accurate and fast point of care results.

More About Us and Our Team

Our head office is located on the outskirts of Derby, ideally situated with excellent road, rail and air transport links. OdiliaClark has a European network of fully trained and equipped Testing Associates and counsellors offering clients access to a full OdiliaClark standard test with certified Draeger equipment

Operational Impact

The detection equipment used by OdiliaClark is designed to specifically look for active impairment, only looking for drugs or alcohol acting on a donor's system. This significantly reduces the rate of false positives and false negatives, ultimately limiting the impact of testing on business operations and keeping staff operational.

Workplace Dignity

The processes and systems used are designed to fit around your business operations with the dignity of staff at the forefront of everything we do. There are no special facilities or requirements required for testing, whether it be lineside at an airport, dockside or even at the roadside.

Delivering Results

Whether outsourcing testing or equipping the organisation to deliver testing in-house, there are a number of options available to ensure testing is transparent, impartial and accurate.


Employees Protected


Trusted Customers


Tests Completed

Impairment vs Lifestyle

Detection of Impairment

Oral fluid allows the detection of substances acting on a donor at the point that sampling is performed. Known as the window of detection, this gives an insight into any potential impairment of the individual (drugs or alcohol acting on the donor). This differs significantly to urine based sampling systems that will not show a substance for up to two days after consumption. This means that the organisation is not protected from the impact of impaired staff.

Union Buy-in

If union buy-in is a concern, early engagement and education into the key principles of impairment-based testing solutions will help to ease concerns. Unions naturally want the best for their members, so it is important to demonstrate to them that this method of testing is about supporting employee wellbeing and operational safety, rather than looking into the lifestyle choices of the employee.

Reducing Cost

Urine testing can show a non-active substance in a donor for up to four weeks, known as a legacy metabolite. Any finding will trigger the process of sending samples to a certified laboratory for further investigation, causing a knock-on operational impact to the organisation. In comparison, impairment testing will show what a donor has in their system for a maximum of 48 hours, reducing the opportunity for legacy detection by 672 hours.


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Interested in finding out more about our Drug and Alcohol testing services?

Our happy clients...

I'd like to thank OdiliaClark for the support of the recent weeks with the provision of advice, training and enabling Gemini Rail Group to introduce a robust self-sufficient solution into Drugs and Alcohol testing. The education class enabled the team to flawlessly execute our winter schedule of random testing.

Rob Mackay | Gemini Rail Group

We had an issue with some of our apprentices as they were coming in to work. We worked with OdiliaClark to develop the policy and company approach towards drugs and alcohol management, we then informed the staff of the new working requirements and held an amnesty period during which the OdiliaClark team rolled out education across the business. We then agreed a testing schedule which was has been smoothly executed. A very positive experience.

Health and Safety Manager | Engineering Sector, Manufacturing

The sector knowledge and experience of the team at OdiliaClark enables them to identify the right solutions for our operating profile. We have the right solutions in place and a high level of confidence in the testing and results.

John | Business Jet COO

These systems provide us with results which tell us a person is fit for work and able to work safely at the time of testing. Which ultimately means less lost in terms of productivity and minimises the disruption which can be experienced with urine testing

Pam | Construction, Civil Structures

Frequently asked questions…

We understand you may have questions, please read our FAQ below, For any further requests or support send us your questions to and one of our team will be in touch.

You can chat to us using the live chat below or email with any questions.

Testing programmes vary from one business to another. We can offer fully outsourced drugs and alcohol testing programmes or we can train your staff to carry out drugs and alcohol testing inhouse. Annual refresher training is required for all inhouse testers.
Yes, we work in a variety of industries throughout the UK, Europe and further afield.  We are always open to brining a new location on line.  Contact us with any questions.

A list of all personnel on site on the day of testing will be generated prior to the Testing Associate arriving on site. This list will be provided to the Testing Associate from the Testing Agency who will randomly select the appropriate number of individuals.

Yes, they will be asked by the Testing Associate if they agree to be tested. The Donor must provide written consent. The employee should be made aware that a refusal to be tested will be regarded as an unreasonable response and treated as a positive test result which may lead to disciplinary action up to and including dismissal.

There is robust statistical evidence to suggest that workers attend work under the influence of alcohol and drugs. Helicentre Aviation is committed to maintaining a safe working environment for all. Unannounced random drugs and alcohol testing is one of many ways to meet this objective.

Most medications are safe to take but any medication either prescribed or over the counter medication has the potential to cause side effects which could affect yours and others safety in the workplace.  You should advise your GP/Pharmacist of your job role and/or operating plant and equipment or operating in a potentially dangerous environment.  The GP/Pharmacist can then decide whether it is appropriate for you to work normally or recommend alternative arrangements.  If you are experiencing side effects such as drowsiness, fatigue or adverse effects to your balance and you work in a safety-critical role or drive for business you should let your line manager know. They may take advice from Occupational Health to ensure it is safe for you to continue to undertake your current duties or find out if a temporary amendment to duties is required.

Yes. Any support will be conditional upon you accepting professional help and adhering to an agreed support programme. Recovering from a substance abuse issue can be a lifelong journey and you should have no problem with being tested regularly. Attending work whilst under the influence of either drugs or alcohol is not acceptable and will be considered as gross misconduct and may lead to disciplinary action up to and including dismissal.

Yes. Alcohol can stay in your system for a significant period. Alcohol metabolises at different rates and is dependent upon various factors including an individual’s build, health and any other medications they may be taking. It is your responsibility to report for work unimpaired by alcohol or drugs or their effects.

Many factors determine how long drugs remain present in the body. Some drugs, including cannabis, can be detected weeks after consumption and therefore unannounced, random screening may lead to a positive result.  It should be noted that many recreational drugs are illegal and there is a significant risk of prosecution if such substances are consumed whilst at work.

Yes. You will be asked about any medications you are taking if the test leads to a non-negative result. All non-negative results will require further laboratory analysis. The Testing Associate will ensure that all information about your medication is noted with the sample. Taking more than the prescribed amount can affect performance and may be regarded as misuse or abuse.

If you take the medication responsibly, and have discussed it with your line manager if in any doubt, then a non-negative test should not be a concern for those medications. Modern testing equipment can detect low levels of drugs, and the laboratory process is part of separating out what is acceptable intake of medication and what is not.

This depends on whether your role or activities are classified as safety critical. The decision process can be found in Appendix D.

In these circumstances, it will be regarded as gross misconduct and you will be suspended from duty immediately and liable to disciplinary action up to and including dismissal.

A process known as ‘chain of custody’ applies. This ensures that two samples (Sample A and Sample B) are clearly labelled and sealed in tamper-proof tubes and envelopes in front of the Donor. It provides an audit trail for the sample sent for analysis to safeguard its identity and integrity from collection through to reporting of the test results. The process is auditable to ensure compliance and that a defensible report is produced. Sample A will be tested to verify positive/negative result from the on-site testing. The laboratory will hold your sample B for up to four months in case of dispute or if you wish to organise an independent analysis of your sample at your own cost.

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