Question: Our workers are predominately casual labourers. What should we do if they are working on weekends (for example) for another company and turn up fatigued on Monday morning to work for us?

We know we cannot force them not to work when they want (or need) to; but how can we enforce our policies and procedures that attempt to provide a safe and healthy work environment when the worker could potentially be not ‘fit for work’ at the start of a shift?