DNA has often been referred to as the gold standard of forensic evidence. And when comparing a single sample to a suspect, that’s true. When DNA evidence includes mixtures of DNA from multiple sources, however, the scientific community is still figuring things out. And it takes years for new knowledge to pass down from the highest-end basic research to the work tables of practicing DNA analysts at front-line crime labs. For more, read this post from our friends over at Grits for Breakfast.