What is the most important forensic evidence?
It appears the Forensic Science Service believes it has discovered compelling new evidence, possibly from more than one source. Portuguese detectives told Mrs McCann repeatedly that they found traces of Madeleine’s blood in a Renault Scenic hired three weeks after she disappeared, suggesting that the missing girl’s parents used the vehicle to carry her body. It is possible to tell if the blood came from a living person or from a corpse, and even the time of death. However, some reports suggest that the quality of the blood sample was too poor to confirm the origin while others have denied any blood was found in the vehicle and claim it was other “bodily fluids”. Unless a body had been placed in a freezer, it would have badly decomposed during the warm weather; leaving a mass of traces invisible to the human eye. Does any trace of Madeleine in the hire car prove she was killed? No. Mr and Mrs McCann hired the car to buy new clothes in the town of Portimão a day before they flew to Rome
