DNA, which is also known as the genetic fingerprint, is present in many substances that are known to be biological, such as blood, skin cells, bones, and saliva. Because these many people carelessly leave their DNA on many items such as glasses, and face wipes, investigators gather the DNA and use it for vital evidence involving crimes. DNA has been used to identify suspects years after they have been accused of committing a certain crime. One example of this was when Baltimore County, Maryland, detectives, reopened a difficult case and pursued leads in a controversial sexual-assault homicide case that had not been solved for about 19 years. In an effort to identify DNA evidence from the victim, some officers in the case requested
