Evidence that might be found at a crime scene may consist of blood, skin, hair, semen, saliva, and urine.
Respond to the 2 discussions in 75-100 words.
1) When collecting DNA evidence it is always challenging. You need to know what you are collecting. You also need to know how to properly store the evidence. Here are some examples of biological evidence is blood, saliva, sweat, skin, semen, tissue, teeth, bone, feces, urine, hair and nail clippings. You have to make sure you do not cross contaminate the evidence, because if you do it will have to be get thrown out and that could lead to a person that is guilty to go free. You can use cotton tip applicators, like swabs, to collect the biological evidence. when collecting biological evidence make sure you are using gloves and use the right tools also. Crime scene investigator also collect fingerprints, footprints and tire tracks. To collect a fingerprint there are a few ways to do it Like using tape and taking a picture of it. Collecting the footprints and tire tracks they can take pictures of them and they can also make a mold of them so they will have something to compare them to.
2) Evidence that might be found at a crime scene may consist of blood, skin, hair, semen, saliva, and urine. Swabs (cotton tip applicators) collected for biological evidence may include buccal, oral, skin, fingernail scene investigators collect evidence such as fingerprints, foot prints, tire tracks, bite marks, perineal, perianal, vaginal, cervical Os, penile, scrotum, rectal. Hair collected is placed in an envelope. Comparing DNA profiles from the evidence with elimination samples may help clarify the results. DNA evidence is not initially identified at the crime scene or on the victim, it may not be or it may become contaminated. DNA evidence can become contaminated when DNA from another source gets mixed with DNA relevant to the case. Three types of results can occur in DNA testing: inclusion, exclusion, and inconclusive. Inconclusive results indicate that DNA testing could neither include nor exclude an individual as the source of biological evidence. DNA from the victim with that of other DNA evidence found at the crime scene to determine possible suspect. This class has taught me so much about the aspect of forensics.
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