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“From what he told us, we understood that there was, you know, maybe one other person involved but it didn’t, from our impression, make it sound like it was a widespread operation,” one of the individuals told Mathews. “It was more of an individual endeavour.”

Another witness produced by Hamilton testified that he “understood from Sona that Sona obtained a [telephone] list by impersonating someone from the Liberal campaign, using an alias.”

The names of the six witnesses — none of whom worked on the Guelph campaign — remain under a publication ban, with a decision to be announced Friday on whether that information can be released.

From what he told us, we understood that there was, you know, maybe one other person involved but it didn’t, from our impression, make it sound like it was a widespread operation

The documents contain claims that have not been proven in court.

A number of other people who were actually involved in the Guelph Conservative campaign have refused to co-operate with investigators.

In a separate Federal Court civil suit, Judge Richard Mosley ruled last May that elections telephone fraud took place “in ridings across the country,” although he failed to overturn results in six contested ridings in a civil suit bankrolled by the Council of Canadians.

Mosley concluded that the “most likely source of the information used to make the misleading phone calls was the CIMS database maintained and controlled by the [Conservative Party of Canada], accessed for that purpose by a person or persons unknown to this court.”

The testimony to Mathews was included in court documents used by the former career RCMP investigator in his efforts to obtain documents from a credit card company called Peoples Trust. Sona is alleged to have used four of these prepaid credit cards to buy a “burner” cellphone and set up robocalls through an Alberta-based company, Rack Nine.

Mathews said in the document he has grounds to believe “that Michael Sona, in the period shortly after election day, advised several of his acquaintances of participation in the false calls made to Guelph voters.”

— With files from Steve Rennie