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Saliva and blood collected ;s in Guylaine Potvin’s apartment in April 2000

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Guylaine Potvin was killed in Jonquière in 2000.

  • Mireille Chayer (View profile)Mireille Chayer

Voice synthesis, based on artificial intelligence, allows you to generate spoken text from written text.

A forensic biologist, Caroline Paquet, explained to the jury at the trial of Marc-André Grenon that no trace of sperm had been taken from the body of Guylaine Potvin, murdered in April 2000 in Jonquière. However, saliva was taken, as well as blood on his t-shirt and on a belt seized from his apartment.

It was not Ms. Paquet who worked on the case of Guylaine Potvin at the time, but she based herself on the work carried out by two of her colleagues in order to prepare her testimony in court on Wednesday morning.

Caroline Paquet has worked at the Montreal Judicial Science and Legal Medicine Laboratory since 2005 and has become coordinator of unresolved biology cases since 2021.

< p class="StyledBodyHtmlParagraph-sc-48221190-4 hnvfyV">DNA is the basis of our work, she explained to the jury. She recalled that DNA is a molecule present in the nucleus of cells. It is found in the form of chromosomes. She said humans' DNA is 99 percent identical and forensic biologists look for variation in the remaining percentage point. It is with this variation that it is possible to establish the genetic profile of an individual.

Caroline Paquet told the jurors that her laboratory received various pieces of evidence, such as objects or biological samples. These parts are subjected to analyzes in an attempt to establish genetic profiles.

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We work by comparison, she said. We establish the genetic profile and compare it.

She explained that DNA taken from crime scenes or from victims was preserved forever in laboratory freezers.

In the case of Guylaine Potvin, many pieces were submitted to the laboratory at the time.

The specialist's testimony continues Wednesday afternoon at the Chicoutimi courthouse.

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