for Public Health was empowered to examine, detain or isolate anyone with the disease or believed to have been in contact with a sick person. The Queensland Police were authorised to apprehend people or take other actions to prevent breaches of the public health laws. Initially the only border crossings allowed (and supervised by the Queensland Police) were Coolangatta, Wallangarra and Goondiwindi, but faced with public pressure, the Queensland Government extended border crossing points to include Wompah, Hungerford, Wooroorooka, Adelaide Gate and Mungindi. Mungindi was to become a popular target for "border breakers". Despite not being official entry points, the police were required to actively prevent crossings at border locations such as Killarney, Stanthorpe, Texas and Hebel. A number of police officers died from infections acquired in protecting the border. In May 1919 the restrictions on border crossings were removed as it was apparent that the virus was well established in Queensland and police administering at the border crossings were returned to their normal duties. Qantas was founded in 1920 to serve outback Queensland. 1920 saw Matthew Nathan become Governor and actively promotes British migration to Queensland. The Mount Mulligan mine disaster killed 75 workers in 1921. In 1922, the Queensland Legislative Council was abolished, making Queensland the only Australian state (to this day) without a bicameral legislature. On 9 June 1925 the Traverston rail disaster occurs – the worst rail disaster in Queensland's history until 1947. In 1927, the Duke and Duchess of York toured Queensland. They were here to open Parliament House in Canberra but spent time in southern Queensland to meet and greet people. In 1928, the Royal Flying Doctor Service of Australia makes first flight, departing from Cloncurry. Also, in 1928, Sir Charles Kingsford Smith landed the Southern Cross in Brisbane, completing the first trans-Pacific flight. In 1935, 101 cane toads were brought into Queensland to try to control pests on sugar cane crops, and bred to 3,000, which were released into areas around Cairns, Innisfail and Gordonvale. They have since spread to many parts of Queensland, New South Wales and the Northern Territory. In late 1936 a lightning strike hit the Bundaberg Rum Distillery, destroying the distillery without any loss of life. It was rebuilt and is currently operating on the same site today. The state's first national park ranger, Mick O'Reily was temporarily appointed between 1919 and 1923. Second World War During World War