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Process Essay: Analyzing Forensic Evidence

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The world of forensic science is full of ever developing technology. Analyzing forensic evidence involves using fingerprints, hair samples, blood, footprints, bite marks, and other sources of material to help identify someone. Each small piece of evidence found at a crime scene can be crucial — leaving the slightest trace of saliva or skin cells can be what convicts a person. Few people know the importance of forensic science more than Steven Avery. In Making A Murderer, the 10 part documentary that originally aired on Neflix, the focus is on Steven Avery. In 1985, Avery was wrongfully convicted of a rape and sentenced to 32 years for the rape of Penny Beernsten — even though there were 16 witnesses to prove that Avery wasn’t present at the …show more content…

Retrieving the sample is the first step in which blood is swabbed, hairs collected, skin cells collected, or saliva swabbed. Next comes extraction which is the process in which scientists release DNA from the sample. Quantitation is the next step in which fake or partial matches come into play — this step involves figuring out if you have enough DNA for a match — the step where partial fingerprints come into play. Amplification is where the scientists makes a copy or copies of the DNA to help find a match. Separation is the 5th step where the analyst separates the DNA to give the ability to match it to someones DNA. The 6th and technically last step is Analysis and Interpretation where the DNA is actually put into a system in order to attempt to find a match. The 7th step is Quality Assurance where the scientists and others look at the sample and match to see if the result was accurate and if everything was done correctly. Results of DNA testing aren’t how it’s shown on television. Reports from the DNA sample are generated into a graph showing the person’s two alleles. Those two alleles can be put into a system to find those individuals who have the same alleles as the ones found in the DNA. (A Simplified Guide to DNA Evidence, …show more content…

In this example, the fingerprints are found on a piece of paper. First you spray the fingerprint with the ninhydrin solution and allow it to dry for a few minutes. After it dries, two sheets of paper towels are placed on the bottom of the sheet of paper and two sheets of paper towels are placed on top. A clothing iron is used to apply heat to the paper towel — the heat and moistness develop the fingerprints. You continuously check the fingerprints to see if they are developed enough and once they are, the fingerprints are placed under an extremely strong light and examined with a magnifier or an image is take of the prints and sent to the lab. Furthermore, spraying the print with acetone after the ninhydrin process can develop more detail from the fingerprint. (Forensics Lab 8.3: Revealing Latent Fingerprints Using Ninhydrin, n.d.) These latent prints need to be fingerprinted as soon as they are developed as latent fingerprints and known to fade. (Wertheim,

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