Biological Evidence Paper
Tricia Taylor
CJA 215
06/17/2016
Dr. Denise Mowder
There are many different biological evidence that help with criminal investigations. Fluids such as blood, saliva, semen, and even hair follicles have been proven to help identify suspects in murders, rapes, assaults, burglaries and other crimes. Due to the properties that carried in blood, saliva and semen, these liquid substances can cover a surface or penetrate through items where it cannot be easily cleaned or removed. When those deposits happen that leaves your biological evidence behind. In results to this happenings, these liquids cannot be seen if it’s dried up and it won’t be noticed by the naked eye. No two person’s genetics are the same except for identical twins. Each and every individual have distinct genetics that only there bodily fluids and hair would match them. When a DNA test of these biological deposits are taken, this helps to get a genetic marker that help match the results to a person (If an investigation took place of a crime then those genetic markers can help identify the suspect. The information can also be used in a criminal court case. This paper will outline all the key points in biological evidence, the history and the reasons for gathering such information especially in the use of a criminal investigation.
Biological Evidence History
DNA which is Biological Evidence have been used since the 1980’s. The first form of DNA came from a fingerprint which was founded by Dr. Alec Jeffereys in 1985 in England. Dr. Alec Jefferys discovered that the DNA consisted of distinct patterns that would match someone. These patterns varied from person to person. Dr, Alec Jefferys made a system that would determine whose DNA reoccurred over and over (DNA Initiative). With this results happenings, we are able to identify people in a database and compare DNA samples.DNA that keep recurring was known as variable number of...