INTERVIEW
As revealed by Europe 1, the man arrested Friday night is not Xavier Dupont Ligonnès, to believe the test DNA made by the Scots. However, many sources claimed that the fingerprints corresponded with those of Xavier Dupont de Ligonnès. Interviewed at the microphone of Europe 1, Cossimo Prété, expert with the Scientific Police, returns on the method of authentication of the man arrested Friday night.
"What most likely happened was that we had a fingerprint found on the crime scene," says Cossimo Prété. "But we had no way of knowing if this imprint belonged to Xavier Dupont de Ligonnès to the extent that it did not appear in our database". "We did a comparison study of fingerprints, but it was not enough, we needed DNA to formally identify it," he says.
Different rules in each country
A visual cue has been made in Scotland on fingerprints, but as explained by Cossimo Prété, "the rule on the number of corresponding points changes according to the countries". The inspectors in Glasgow had five points, "which was not enough to identify an individual". "It takes at least twelve," says Cossimo Prété at the microphone of Europe 1. "It takes a bundle of convergences of several identification techniques to be sure that it is the individual and in this case it was necessary resort to DNA because Xavier Dupont de Ligonnès was not in the fingerprint file ".