Advances in DNA analysis help Spanish police solve old crimes

The biologist Antonio Alonso explains that due to the lack of evidence, in 2004 the police asked the National Toxicology and Forensic Science Institute for a thorough analysis of some of Inmaculada’s clothes. Alonso’s team then achieved what had previously been considered impossible: they detected microscopic traces of a man’s saliva on the shirt and bra of the girl. The scientists got to work. The DNA analysis showed that the Y chromosome that passes from fathers to their male offspring was very similar to that of another man in Inmaculada’s close circle from whom samples had been taken. His surname was Muñoz-Quirós.