The risks posed by employee substance abuse can be significant in businesses, potentially placing both the workforce and customers in danger. It is therefore crucial that employers are prepared to identify and fully respond to the issue of workplace drug use or addiction.

Substance addition is defined as a strong psychological dependence on a drug or other agent, including alcohol. Addiction can have a significant impact upon both the physical and mental wellbeing of the person in question, affecting their ability to conduct daily activities and impairing their judgment.