(Photo : Pixabay/ckstockphoto) DNA samples DNA samples sent to a gene sequencing lab helped solve a three-decade-long case. The Las Vegas police department is using ancestry to find suspects of cold cases. DNA Samples Solved a Young Girl's Murder Case According to BBC News, the Las Vegas law enforcement solved the 1989 murder of 14-year-old Stephanie Isaacson by using a small volume of DNA. The Las Vegas police sent 0.12 nanograms of DNA samples to Othram's gene sequencing laboratory. The standard collection of DNA samples in a kit is 750 nanograms. Othram used the gene sequences to run through the ancestry database. The result pointed them towards the direction of the suspect's cousin, and there they've identified Darren Roy Marchand as the murderer.