An alleged brawl occurs outside a bar and a sample, that appears to be a mixture

Question

An alleged brawl occurs outside a bar and a sample, that appears to be a mixture of blood and mud, was collected. The sample was collected at the scene by an investigator and it was submitted to the laboratory for DNA analysis.

List five important factors that may compromise a final accurate conclusion of the analysis. Explain the possible effect of the factors you have chosen on the analysis or conclusion, indicating where, in the process from sample collection to production of the report, these might have an influence

Explanation / Answer

Finding blood with the victim's genetic markers blood types, DNA profile, etc on the suspect, on something in the suspect's possession, or something associated with the suspect (such as the suspect's fingerprints). Finding blood with the suspect's genetic markers on the victim, on something in the victim s possession, or something associated with the victim. Investigative information determined from blood spatter and/or blood location. investigator should concentrate on collecting representative samples of the "peripheral" bloodstains, such as the bloodstains that are away from the body and the main area of action, or blood spatter patterns that differ from the majority of the blood spatter patterns. These bloodstains may provide useful investigative information. The investigator should also search for blood trails leading away from the scene. These trails could have originated from a wounded suspect. If a suspect is established in a case, then he or she should be examined for wounds. videotaping blood evidence is that the overall relationship of various blood spatters and patterns can be demonstrated. One example of this could be a beating homicide. In this case, videotape can show the overall blood spatter patterns and how these spatters are inter related. The videotape can also show the relationship of the spatters to the various structures at the crime scene.

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