Australia’s official policy on vaccines is they be voluntary and free. But the federal government hasn’t shut the door completely on employers pursuing mandatory policies of their own. So far just two Australian companies, regional air carrier Alliance Airlines and canning company SPC, have declared they will make a COVID-19 vaccination mandatory for their workers. The reason so few have declared such intentions is because the law isn’t on the employer’s side. There are only limited circumstances where workplace vaccine mandates are likely to...