I have been harping on about the new Workplace Health and Safety laws lately but I believe it is hugely important. Workers should always go home just as happy and healthy as when they came to work. If they come to work unhealthy and grumpy then that's their problem.
Work Safe Australia has put out a number of draft codes of practice that are really informative and should definitely be read by anyone with a duty of care to employees and workers.
I've provided this one today as it's a good starting point. It's the new draft code of practice for Managing and Assessing Risk. Click the link for the PDF version