Whatever is said I don't think any samples were kept so the resuults can never be checked.
https://www.mccannpjfiles.co.uk/P9/09_VOLUME_IXa_Page_2282.jpg
A Met Police team led by DCI Andy Redwood announced their wish to look again at forensic material collected in the early days of the Madeleine McCann investigation during a visit to the university town of Coimbra earlier this month.
They met with senior officials of Portugal’s Institute of Legal Medicine and Forensic Sciences in Coimbra, two hours drive north of Lisbon, where most of the material, also said to include 25 blood and saliva samples, is held.
Institute president Francisco Brizida, said afterwards: “I have the certainty they went away very happy.”
“The tonic of the meeting was about the possibility of the tests on samples collected in 2007 being re-done.
“The British police wanted clarification on the examinations the institute had carried out during the early stages of the inquiry in the areas of genetics and biology.
“We talked about non-identified material that was collected in Madeleine’s apartment.
“I can’t say for sure new DNA tests that didn’t yield a conclusive result in 2007 could now yield an objective result.
“But technology nowadays allows us to go further than years ago in areas like genetic markers.
“Several possibilities are open. One could be that British police do the tests in Britain with British technology and another that the institute does them.
“But that’s an area in which the institute does not have the last word. There’s a situation of judicial cooperation and a new international letter of request would be necessary.”
https://www.standard.co.uk/news/crime/hair-strands-during-original-madeleine-mccann-investigation-never-dna-matched-9825210.html