 As a result, the Speaker often has to use the disciplinary powers granted to him or her under Standing Orders.Since 2015, Australian Federal Police officers armed with assault rifles have been present in both chambers of the Federal Parliament.From the beginning of Federation until 1918, first-past-the-post voting was used in order to elect members of the House of Representatives but since the 1918 Swan by-election which Labor unexpectedly won with the largest primary vote due to vote splitting amongst the conservative parties, the Nationalist Party government, a predecessor of the modern-day Liberal Party of Australia, changed the lower house voting system to voting system to Instant-runoff voting, which in Australia is known as full preferential voting, as of the subsequent 1919 election.