Over more than 20 years performing Alcohol & Other Drug (AOD) testing at workplaces across Australia, we have seen many different methods of random selection. Our favoured method is via computer generated random employee selection as it allows for a completely auditable trail.
Some other methods we have seen is via a marble draw where if a worker selects a white marble they are not subject to testing and when they select a black marble they are subject to AOD testing.
Another method of random selection which some workplaces prefer is Random Division Selection where a group or division is randomly selected and then all personnel in that division or under that supervisor are required to present for random AOD testing.
An important thing to consider when selecting a random selection method is that you choose one that complies with your Alcohol & Other Drug Policy and Procedure, is fair and equitable to all workers and that doesn’t cost your workforce a large amount of worker downtime.