He began to investigate and study the activities of the Canadian Security Intelligence Service, which had been created that year to take over duties formerly under the aegis of the RCMP.

He investigated Claude Morin, cabinet minister and close advisor to René Lévesque and also a paid informant of the RCMP.

After the publication of the first part of the trilogy that is Livre noir du Canada anglais, Radio-Canada suspended him from his work on November 18, 2001, citing a lack of impartiality.

In 2006, he co-authored with Robin Philpot a book denouncing the actions of Option Canada, one of the organizations supporting the No side in the 1995 Quebec referendum.

The actions of this group were alleged to have violated Quebec provincial laws and several key players in the organization would later be investigated for links to the sponsorship scandal.