2024-01-17 20:25:05
In recent years, scientific advances in DNA have been so significant that they would have made it possible to bring charges once morest Marc-André Grenon for the murder of Guylaine Potvin 20 years later.
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“Twenty years ago, we collected DNA, but we were unable to identify anything because this man was not known to the genetic banks. When we took over the file with new technologies and they were able to identify,” explains former SPVQ investigator Roger Ferland.
Moreover, the approach was ingenious on the part of the authorities since they managed to find in the DNA an element unique to Marc-André Grenon.
“In the Y gene, which is specific to humans, you have particles which are transmitted from father to son only. With the data found, investigators were able to trace Mr. Grenon’s family. “It’s really fascinating to see how quickly we’re able to come back,” he says.
This discovery helped investigators identify a suspect years later.
“They probably had a few suspects in their sights, but when they managed to identify [la particularité que c’était un homme de la famille Grenon]. They collected objects to analyze and we realized that this DNA matched the one we had 20 years ago. Subsequently, the authorities asked for Mr. Grenon’s DNA to confirm everything,” he underlines.
See this expert’s explanation in the video above.
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