Employee arrests, drug charges and workplace testing

Employers are increasingly faced with difficult questions when an employee is arrested or charged with a drug-related offence outside of work. A common misconception is that an arrest or criminal charge automatically justifies disciplinary action or workplace drug testing. From a business and compliance perspective, the reality is far more nuanced.

The starting point is that an arrest or charge is not a conviction. Employers should avoid making assumptions about guilt and instead focus on the impact the situation may have on the employee’s role, workplace safety, and the organisation’s legitimate business interests.

Where an employee has been charged with a drug-related offence, employers should consider several key factors:

Does the employee work in a safety-critical role?
Is there a risk to colleagues, customers, or the public?
Are there bail conditions that affect the employee’s ability to work?
Could the matter create a reputational risk for the organisation?
Does the conduct potentially breach a company Drugs and Alcohol Policy?

Employers should conduct a fair investigation and provide the employee with an opportunity to explain the circumstances before reaching any conclusions. Decisions should be based on evidence and risk assessment rather than speculation.

Drug testing presents additional compliance challenges. In the UK, drug test results are classified as special category personal data and are subject to strict data protection requirements. Testing should only be carried out where it is necessary, proportionate, and supported by a clear policy or contractual provision.

A drug-related charge alone may not justify testing, particularly where there is no evidence of impairment at work. However, the position is different in safety-sensitive environments such as construction, transport, manufacturing, logistics, or energy operations, where employers have significant health and safety obligations.

One of the biggest compliance risks arises when organisations seek to test a single employee without a documented policy framework. Selective testing can create allegations of unfair treatment, discrimination, or breaches of privacy rights. Employers are therefore advised to maintain a robust Drugs and Alcohol Policy that clearly defines when testing may occur, including pre-employment, random, post-incident, and reasonable-suspicion testing.

Ultimately, the employer’s role is to balance employee rights with organisational risk. A measured, evidence-based approach protects both the employer and the employee while ensuring compliance with employment law, health and safety obligations, and data protection requirements.

When dealing with criminal charges or allegations of drug use, employers should focus less on the offence itself and more on its demonstrable impact on the workplace.

Contact 121 HR Solutions for a review of your contractual documentation to ensure it is fit for purpose, contact us via enquiries@121hrsolutions.co.uk.

Employee arrests, drug charges and workplace testing

121 HR Solutions Ltd