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Saint was elected to the Louisiana House of Representatives in 1916 but served only one year before resigning in 1917.<ref>{{cite web|url=http://house.louisiana.gov/H_PDFdocs/HouseMembership_History_CURRENT.pdf|title=Members of the Louisiana House of Representatives, 1812-2012 (St. Mary Parish)|publisher=Louisiana House of Representatives|accessdate=December 10, 2019}}</ref> Saint was the district attorney of the 23rd Judicial District from 1907 until 1920. It is unclear if he resigned as district attorney to become state representative from 1916 to 1917 and then returned to the district attorney position or if he was simultaneously district attorney and state representative, a part-time position. Saint was district judge from 1920 to 1924. In 1922, he was assigned to the civil district court in New Orleans.<ref name=lahist>{{cite web|url=https://www.lahistory.org/resources/dictionary-louisiana-biography/dictionary-louisiana-biography-s/|title=Saint, Percy|publisher=''A Dictionary of Louisiana Biography'' by Louisiana Historical Association|accessdate=December 10, 2019}}</ref>

Saint was elected to the Louisiana House of Representatives in 1916 but served only one year before resigning in 1917.<ref>{{cite web|url=http://house.louisiana.gov/H_PDFdocs/HouseMembership_History_CURRENT.pdf|title=Members of the Louisiana House of Representatives, 1812-2012 (St. Mary Parish)|publisher=Louisiana House of Representatives|accessdate=December 10, 2019}}</ref> Saint was the district attorney of the 23rd Judicial District from 1907 until 1920. It is unclear if he resigned as district attorney to become state representative from 1916 to 1917 and then returned to the district attorney position or if he was simultaneously district attorney and state representative, a part-time position. Saint was district judge from 1920 to 1924. In 1922, he was assigned to the civil district court in New Orleans.<ref name=lahist>{{cite web|url=https://www.lahistory.org/resources/dictionary-louisiana-biography/dictionary-louisiana-biography-s/|title=Saint, Percy|publisher=''A Dictionary of Louisiana Biography'' by Louisiana Historical Association|accessdate=December 10, 2019}}</ref>

In 1928, Saint was one of the few state officials elected independently of the Long ticket when the [[Huey Long|Louisiana Kingfish]] procured his only term as governor before heading to the U.S. Senate.<ref name=lahist/> As attorney general, Saint faced the legal challenges of the Mississippi Flood of 1927.<ref>{{cite book|url=http://www.gardendistrictbookshop.com/|author=John M. Barry|title=Rising Tide: The Great Mississippi Flood of 1927 (1998)|publisher=Garden District Bookshop of [[New Orleans]]|accessdate=April 16, 2011}}</ref>​

In 1928, Saint was one of the few state officials elected independently of the Long ticket when the [[Huey Long|Louisiana Kingfish]] procured his only term as governor before heading to the U.S. Senate.<ref name=lahist/> As attorney general, Saint faced the legal challenges of the [[Mississippi River]] flood of 1927.<ref>{{cite book|url=http://www.gardendistrictbookshop.com/|author=John M. Barry|title=Rising Tide: The Great Mississippi Flood of 1927 (1998)|publisher=Garden District Bookshop of [[New Orleans]]|accessdate=April 16, 2011}}</ref>​

In other matters relating to his nemesis Long, Attorney General Saint declared that Long should not have dispatched troops to raid [[gambling]] houses in Jefferson Parish in the New Orleans [[suburb]]s  without first having declared [[martial law]]. He also ruled that [[impeachment]] proceedings instituted in 1929 by some legislators, including Cecil Morgan (1898-1999)  of [[Shreveport]], against Long were constitutional.<ref name=lahist/> Saint retired from politics in 1932, when Oscar Kelly Allen, Sr. (1882-1936), of Winnfield was  elected to succeed Huey Long as governor.<ref name=lahist/>​

In other matters relating to his nemesis Long, Attorney General Saint declared that Long should not have dispatched troops to raid [[gambling]] houses in Jefferson Parish in the New Orleans [[suburb]]s  without first having declared [[martial law]]. He also ruled that [[impeachment]] proceedings instituted in 1929 by some legislators, including Cecil Morgan (1898-1999)  of [[Shreveport]], against Long were constitutional.<ref name=lahist/> Saint retired from politics in 1932, when Oscar Kelly Allen, Sr. (1882-1936), of Winnfield was  elected to succeed Huey Long as governor.<ref name=lahist/>​