DNA profiling was one of the greatest advances in technology and science in the 20th century due to its efficiency in identifying individuals. It is commonly used by forensic scientists for the identification of suspects or individuals at crime scenes. The DNA profile as it exists today was developed from two independent molecular biology studies that took place during the same time period, in two different places, and by two different scientists. In 1985, Alec Jeffreys developed a technique called DNA Fingerprinting, also known as DNA profiling. And Kary Mullis invented the polymerase chain reaction which is a biochemical technology in molecular biology used to amplify a single DNA sample across many orders of magnitude generating millions of copies of a specific DNA sample. Modern DNA profiling is called STR, which is a very sensitive technical method that helps CSIs identify criminals. It is the process of obtaining a specific DNA pattern from a person or a sample of any body tissue. Typical patterns of genetic profiles are produced by electrophoresis of processed DNA samples. These patterns can be called fingerprints. In criminal investigations, approximately 10 DNA sites are analyzed. If the gang patterns produced from the tested DNA samples of a crime suspect and the samples taken from the crime scene are the same, that is enough evidence to convict a suspect and take him to prison. 99% of human DNA is exactly the same for all people, even if a single drop of blood, or an eyelash collected at a crime scene, contains all the genetic information necessary for every single person in the world to convict a criminal . DNA profiling has had a huge impact on many things, from... middle of paper......: http://www.brighthub.com/science/genetics/articles/65420.aspx [Accessed : 31 March 2014].Freeman, S. (2014). HowStuffWorks “How DNA Profiling Works.” [online] Retrieved from: http://science.howstuffworks.com/dna-profiling.htm [Accessed: March 31, 2014].Grow - Wisconsin Journal for the Life Sciences. (2011). How DNA profiling works. [online] Retrieved from: http://grow.cals.wisc.edu/health/how-dna-profiling-works [Accessed: March 31, 2014].Museum, S. (2014). What is DNA profiling?. [online] Retrieved from: http://www.sciencemuseum.org.uk/whoami/findoutmore/yourgenes/whydoscientistsstudygenes/whatisdnaprofiling.aspx [Accessed: 31 March 2014].Oak, M. (2014). The ten main scientific discoveries of the 20th century. [online] Retrieved from: http://www.buzzle.com/articles/scientific-achievements-top-ten-scientific-discoveries-of-the-20th-century.html [Accessed: March 31 2014].