Cold case files recently began re-investigating an old murder case. The murder took place in the park; a young man, James, was hit over the head with a brick and killed. Police suspected the jealous former boyfriend of James' wife, Karen. Whoever killed James may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. Since the murder took place before DNA fingerprinting was available, the suspected killer, Ronnie, went free. Detectives are now reviewing the blood evidence using DNA fingerprinting.

DNA Fingerprinting

Explanation:

DNA fingerprinting is a process in which samples of DNA are taken from evidence left at a crime scene and then are matched with samples of DNA taken from suspects. Often, perpetrators of crime leave some kind of physical evidence at the crime scene, such as saliva, hair, blood, or semen. DNA samples can often be collected from this and can then be compared with those who are suspected of committing the crimeIt allows us to identify an individual from biological samples. It's called fingerprinting because, just like identifying an individual based on the unique patterns we find on their fingers, we identify an individual based on the unique fingerprint of their DNADNA fingerprints assist police due to their ability to identify individuals by their genetic markers. It is both a highly consistent and accurate form