BOISE, Idaho — The 19-page probable cause affidavit resulting from the investigation into the quadruple homicide of University of Idaho students in Moscow featured a slew of new or elaborated-upon information, including the fact that a knife sheath was left at the crime scene.
Investigators said they found DNA evidence on that sheath that eventually helped lead them to a suspect, Bryan C. Kohberger, who was arrested Dec. 30 at his family’s home in Pennsylvania.
DNA comparisons are often not indisputable, but they remain significant pieces of evidence in investigations and at trials. But how do police and lab analysts use genetic evidence, what are the forms of testing, and what are the pros and cons of DNA evidence?
