Refresher courses are necessary to ensure that employees are up to date with the latest information and skills relevant to their job. These courses can help reinforce prior training, highlight new information, and provide an opportunity for employees to ask questions and clarify their understanding of key concepts.

They can be especially important for topics such as drugs and alcohol in the workplace, where regulations and guidelines may change over time. By taking the time to refresh their knowledge, employees can help maintain a safe and productive workplace for themselves and their colleagues.