Final answer:
The subject of this question is law, specifically the case of John Mark Karr and the murder of JonBenet Ramsey. Karr falsely confessed to the murder, but there was no evidence linking him to the crime scene and DNA samples did not match the DNA found on JonBenet's body.
Step-by-step explanation:
The subject of this question is Law. The question pertains to the case of John Mark Karr, who falsely confessed to the murder of JonBenet Ramsey in 2006. Despite Karr's confession, there was no evidence linking him to the crime scene, and DNA samples taken from Karr did not match the DNA found on JonBenet's body. These factors cast doubt on Karr's claims and eventually led to his release.