Born in Baton Rouge, East Baton Rouge Parish, Louisiana, Favrot attended the public schools and was graduated from Louisiana State University at Baton Rouge in 1888 and from the law department of Tulane University, New Orleans, Louisiana, in 1890. He was admitted to the bar in 1890 and commenced practice in Baton Rouge, Louisiana. He served as district attorney of the twenty-second judicial district of Louisiana 1892-1896. He was an unsuccessful candidate for reelection in 1896. He served as delegate at large to the State constitutional convention in 1898. He again served as district attorney 1900-1904. He served as district judge 1904-1906.
Favrot was elected as a Democrat to the Sixtieth Congress (March 4, 1907-March 3, 1909). He was an unsuccessful candidate for renomination in 1908. He served as member of the State house of representatives 1912-1916. He resumed the practice of law in Baton Rouge.
Favrot was elected to the Sixty-seventh and Sixty-eighth Congresses (March 4, 1921-March 3, 1925). He was an unsuccessful candidate for reelection in 1924 to the Sixty-ninth Congress. He returned to the practice of law in Baton Rouge.
Favrot was elected judge of division B of the nineteenth judicial district court in 1926 and served until his death in Baton Rouge December 26, 1934. He was interred in Roselawn Memorial Park.
On November 7, 1907 he murdered Dr. Robert Henry Aldrich (a prominent Baton Rouge Doctor) in the lobby of the Raymond Office Building. Aldrich, it had been alleged had been having an affair with Favrot's wife. They had been school boy pals growing up. Favrot shot Aldrich 3 times, twice in the face and once in the chest. He was released from prison 5 months later after the Grand Jury found no grounds to indict.
[New York Times 11/07/1907]