Duchesneau began his career at the Montreal Urban Community Police Service (SPCUM) in 1968. He first appeared in the public eye in 1981, when as a young sergeant-detective, he arrested his own boss for stealing drugs from the evidence locker.[2] From 1994 to 1998, he commanded the SPCUM and simultaneously served as treasurer of the International Centre for the Prevention of Crime, vice-president of the Canadian Association of Chiefs of Police, and president of the Quebec Association of Police Directors. After retiring from his police career in 1998, he campaigned to become the Mayor of Montreal with his party Nouveau Montréal, finishing second with 26% of the vote, behind incumbent Pierre Bourque (44%) but ahead of former Mayor Jean Doré (10%). After losing the race and failing to secure a seat as city councillor, he retreated to the private sector.[3]
Duchesneau entered the public eye again in early 2010, when the Quebec provincial government, shaken by corruption scandals, appointed him to lead an anti-collusion unit within the Transport Ministry, which would eventually be integrated within the larger Permanent Anti-Corruption Unit (UPAC). In the fall of 2011, Duchesneau leaked to the media a devastating 88-page report documenting cases of corruption and describing an entangled web of links between construction companies, organized crime, Transport Quebec and political donations.[5] He was fired a month later. Testifying on June 14, 2012 in the inquiry of the Charbonneau commission, whose mission is to probe the corruption in Quebec’s construction industry, regarding his motive to leak the report, Duchesneau said he feared his findings would be shelved, arguing the then transport minister, Sam Hamad, showed ‘complete disinterest’ in the report.[6]
Duchesneau is a commissioned officer of the Canadian Forces, who served as honorary colonel of the Canadian Forces Military Police and as honorary lieutenant-colonel of the 62nd (Shawinigan) Field Artillery Regiment (Royal Canadian Artillery). He also served on the board of directors of the Canadian Red Cross. He has written articles on security, terrorism, organized crime, drug trafficking, police ethics, and leadership.
Honours
In 1989, he was awarded the Police Exemplary Service Medal for 20 years of service as a police officer. He received the first clasp 10 years later in 1999.[8]
Catherine Bergeron, Jacques Duchesneau, Romain Gayet, Annie-Clara Gravel, Michel Petit and Florence Scanvic have distinguished themselves by their outstanding involvement with the Comité Mémoire, formed in the wake of the École Polytechnique de Montréal tragedy. They have worked tirelessly to pay tribute to the 14 victims of December 6, 1989. They played a decisive role in organizing the 30th anniversary commemoration, notable for the participation of 13 Canadian universities, elevating the ceremony to the status of a major national movement and amplifying the message condemning violence against women."[12]
His investure ceremony took place on 21 March 2024.