Remember when Barnaby Joyce threatened to have Johnny Depp's dogs put down? Australia's Biosecurity Act gives ministers sweeping powers, from euthanising celebrity pets to slamming shut the nation's borders and forcing all arrivals into mandatory quarantine. This week, the government's interpretation of its powers under the Act went even further, when it issued a sweeping ban on Australians in India from trying to come home. So is it a step too far? Today on The Signal, with the ban on re-entry from India currently being challenged in court, we dig into the law under which the order was made, and ask whether this decision reflects a permanent change of heart on how to keep Australians safe. Featured: David Speers, Host, Insiders, ABC TV