This Practice Note sets out and examines the legal framework for managing intoxicants and conducting intoxicant testing in the workplace in Ireland. It addresses employers’ health and safety duties, circumstances in which testing is legally appropriate and lessons from case law on this topic. Legal background Section 13 of the Safety, Health and Welfare at Work Act 2005 (Ireland) (SHAWWA 2005 (IRL)) sets out that an employee must ensure that he or she is not under the influence of an intoxicant to the extent that she or he is in such a state as to endanger his or her own safety, health or welfare or that of others. ‘Intoxicant’ is defined in SHAWWA 2005 (IRL) as ‘alcohol and drug and any combination of drugs or of drugs and alcohol’. This definition encompasses both legal and illegal substances, and includes prescribed drugs and over the counter medications. SHAWWA 2005 (IRL) also sets out that, if reasonably required by his or her employer, an employee shall, while at work, submit to any appropriate, reasonable