He was elected in a 1913 by-election held after Samuel Charters resigned his seat in the provincial assembly to become Registrar of Peel County.
Fallis' speech outlined his loyalty to Premier of Ontario Sir James Whitney, and his "business-like way" of running the province, highlighting the discounts created by his public hydro policy, good roads program, and reforms to the election process to remove numbering from ballots.
[8] At the beginning of the First World War, Fallis travelled to Ottawa, "securing a letter from officers of the Militia Department" allowing him to sell them horses.
Returning to the County, he formed a partnership with horse-dealer E. J. Jones of Brampton, and they identified animals at area farms for Government inspection; any that were "passed" were purchased by Fallis or his firm.
[9] After being defeated by the Liberal candidate, William James Lowe, in the 1916 by-election, he continued to be active in the livestock trade.
[20] He is also known to have refereed local lacrosse games,[21][22] and served at least one season, 1911, as honorary President of the Brampton Excelsiors.