Pacetti was first elected to the House of Commons of Canada in a 2002 by-election and continued as the Member of Parliament for Saint-Léonard—Saint-Michel sitting with the Liberal caucus until 2014; he served his last year of office as an Independent MP.
Pacetti ran as the Liberal candidate in a by-election in 2002 for a seat in the Canadian House of Commons and was elected in the riding of Saint-Léonard—Saint-Michel.
In May 2009, he introduced bill C-302, an "Act to recognize the injustice that was done to persons of Italian origin through their "enemy alien" designation and internment during the Second World War, and to provide for restitution and promote education on Italian-Canadian history [worth $2.5 million]" which was passed by the House of Commons on April 28, 2010.
[6][7] Both Andrews and Pacetti sat for the remainder of the parliament as independent MPs pending investigation of the complaints.
[7] Pacetti announced on March 18, 2015 that he would not be running in the October 2015 federal election, however he continued to maintain that he is innocent of sexual misconduct.