During the 19th century, the study of fingerprints had emerged. Over the past few centuries, we have seen many developments in the field of fingerprints. Many people give this credit to Francis Galton, who conducted the first study of fingerprints. Galton's research showed that no two fingerprints are the same; his theory on fingerprints changed the world and the criminal justice system as a whole. Galton studied many fingerprints and came to the conclusion that even identical twins will not have the same fingerprints. This discovery helped build the justice system and forensic science as we all once knew it. According to Galton, fingerprints fall into three different categories: loop, arc and whorl. Another fingerprint known as a latent print is a fingerprint formed by sweat. This type of fingerprint is not visible to the naked eye; Typically, a gray or black powder is used to detect latent prints. Now that we know the three basic categories of fingerprints, we need to take a better look at how fingerprints are identified. Once we understand how they are identified with others, we will look at some of the landmark cases that helped DNA become what it is today. In 1987, the United States used DNA evidence to prosecute and convict a serial rapist. It all started in Florida when a woman was woken up by a noise. She woke up and a man was standing over her, brandishing a knife at her, threatening to kill her if she didn't obey. While she was being raped, she began to fight back, she was cut on her neck, legs, feet and face. Once she was raped, the rapist stole her purse and left the house. The victim reported the crime to the police shortly after. During an examination, a rape kit was made and traces of semen were in the middle of one paper...another. Unfortunately, it often happens that a homeless person is the victim of such a situation that they easily go unnoticed and are not always given the opportunity to confront their attackers. In 2005, a case occurred that shook the neighborhoods of St. Petersburg, Florida. A woman named Sara Lynn Wineski was brutally raped and strangled. On May 25, 2005, neighbors heard screams and said it sounded like someone was being tortured, but no one bothered to investigate or call the police. The next afternoon, the body of a woman was found under a terrace behind a house. DNA evidence was collected at the scene, but there was little progress and too many suspects. It wasn't until 2010 that Raymond Samuels' DNA matched that found on Wineski. Samuels was already serving time for attempted murder and kidnapping. He will be extradited from Ohio to Florida to serve his life sentence..