According to an affidavit, authorities located DNA of a single male source that was left on the button of a knife sheath found near one of the Idaho victims. Surveillance video was also used to link a vehicle they believed to be the suspect's.
Authorities say the DNA of the man accused of killing four University of Idaho students was found on a knife sheath recovered at the crime scene. Kohberger was arrested Friday in Pennsylvania, more than six weeks after the Nov. 13 murders of Ethan Chapin, 20, Madison Mogen, 21, Kaylee Goncalves, 21, and Xana Kernodle, 20, in a Moscow, Idaho rental house. He appeared in court Thursday and was read the murder and burglary charges against him.
Investigators also used surveillance video to link a vehicle they believed to be the suspect's and cell phone location to Kohberger. They got a warrant to go through trash from Kohberger's family home in Pennsylvania, and obtained DNA from the trash, which they were able to identify with a high level of probability as belonging to the biological father of the person whose DNA was on the knife sheath.
In this case, Podini said the DNA found on the knife sheath could have come from a number of different types of cells or a combination, including what's known as touch or trace DNA that involves a small amount of skin cells. "They evidently found a profile that was consistent with being the biological father of the DNA profile obtained from the knife , which means that at least for every region that they analyzed, half of that was present in both individuals," Podini said.How the science has evolved, allowing more killers to be caught
Today, researchers are focusing on improving the type of information that can be gleaned from a genetic profile, with the aim of determining someone's eye color or skin pigmentation, for example, Podini said. Current advancements also hope to refine a technique called DNA methylation to determine the age of a person from whom a sample was collected. Scientists also want to come up with methods to more accurately analyze DNA mixtures, when multiple people's DNA are found on surfaces.
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