A decade ago, DNA testing wasn't that widespread, Morgan said. Most departments were using something called serology. In forensics, serology is basically the broad characterization of different bodily fluids found at a crime scene. It only sometimes looked at DNA, required a pretty large sample, and was not as discriminating as DNA testing is now.
Now, she said, "we can provide our labs with very minute pieces of evidence and they can develop a DNA profile from that... The machinery and the chemicals have gotten a lot more sensitive."