Den "perfekte forbrydelse" findes ikke. Find ud af hvorfor i Forensic Files, hvor virkelige efterforskere sætter spor og beviser sammen for at opklare de mest uhyggelige forbrydelser.
When two boys are brutally attacked, investigators rely on evidence fished out of a nearby pond. It became the first case where diatom analysis was used to place a suspect at the scene of the crime.
S7E2 22 min
