"We are very sceptical about the Iranian process. We're certainly not satisfied with what's been delivered so far by Iran through its investigation. The work to get to the truth is difficult. It's painstaking work. But Canada will be absolutely relentless in trying to get to the bottom of exactly what happened," Goodale said.
According to him, Iran's pattern of behaviour since the destruction of Flight PS752 by its military has convinced Ottawa it can't trust Tehran's version of events.
Canada doesn't have access to the crash site, the evidence gathered by Iranian authorities, witnesses or the accused. But it has created its own team, led by a former CSIS director, to try to piece together the sequence of events.
That team's forensic examination is tapping into all of the government's available intelligence, along with detective work being done by victims' families in Canada. Many of those family members have been sorting through tips, gathering audio recordings from Iranian authorities and compiling evidence from a network of sources in Iran.
As we reported earlier, a year ago, Iran's Islamic Revolutionary Guard Corps shot down Ukraine International Airlines Flight 752 in the skies over Tehran with two surface-to-air missiles, killing all 176 passengers, including 138 people with ties to Canada.