He said that the scientific police and the consultants who carried out the original tests had far more experience than the independent experts appointed by the court.
When the autopsy was carried out, the knife was sent to be analysed in Rome by the scientific police, who were also involved in the Kercher case.
Scientific police evidence presented on Monday, including paint samples removed from vehicle bumpers, seemed to back up the three-crash version.
But the scientific police director has defended the original forensic work.
London had recently established its first professional police force and American cities were beginning to focus on scientific police work as newspapers reported murders and criminal trials.
This annual meeting is an opportunity to listen to scientific talks of great value from other Chilean scientists and workshops aimed at facilitating professional careers, as well as a tool to discuss scientific polices with relevant players of main funding agencies in Chile.
"There was a stage a few years ago where that possibly filtered through to some of our non-scientific police officer customers," Westacott says, "but that seems to have died down recently".
With the scientific and police evidence now unreliable, there was nothing left, he said.
He again urged the court to find the convictions unsatisfactory but not unsafe, even though the Director of Public Prosecutions has chosen not to rely on the scientific and police evidence against them.
But other issues transcend the agency, like reducing the administrative burden on universities receiving federal funds, policing scientific misconduct, and allowing for travel to scientific conferences.
