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The subcategory of evidence deemed trace evidence is frequently seen in crime scenes, and while it is commonly the smallest evidence around, that doesn’t stop it from greatly contributing to the findings at the scene. Blood evidence may be categorized into this group in certain cases at crime scenes, especially

The subcategory of evidence deemed trace evidence is frequently seen in crime scenes, and while it is commonly the smallest evidence around, that doesn’t stop it from greatly contributing to the findings at the scene. Blood evidence may be categorized into this group in certain cases at crime scenes, especially in cases of transfer between two objects or people. In this study, the transfer of blood across both porous and non-porous substrates was examined to determine the persistence of blood across both substrates. The resulting stains after each trial of transfers were tested with a presumptive blood test commonly used in crime labs, the Kastle-Meyer test. Throughout all trials of the experiment, it was determined that blood on a non-porous surface typically dries faster as long as there isn’t a pooling effect, which hinders the ability for a stain to be continuously transferred and detected by Kastle-Meyer. Conversely, porous substrates are more likely to absorb and retain the blood in the material, allowing the blood to be released when pressure is applied, causing the stain to transfer more easily and result in a stain that will produce a positive Kastle-Meyer result.

ContributorsKincade, Morgan (Author) / Weidner, Lauren (Thesis director) / Kobojek, Kimberly (Committee member) / School of Mathematical and Natural Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
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Bloodstain Pattern Analysis and Toxicology are important aspects of Forensic Science in determining what occurred at a crime scene. There are limited studies done on the effects of drugs on blood spatter found at crime scenes. Since drugs can have different effects on the body, the blood would be affected

Bloodstain Pattern Analysis and Toxicology are important aspects of Forensic Science in determining what occurred at a crime scene. There are limited studies done on the effects of drugs on blood spatter found at crime scenes. Since drugs can have different effects on the body, the blood would be affected by these drugs. Visine and Aspirin were chosen to be incorporated into sheep’s blood due to their common use in the general population. Contaminated blood was deposited onto several common surfaces alongside controls. The results were compared to the control and the secondary control, DI water added to blood, using a two-sample t-test. Many of the results came back as significant including the secondary control compared to the control group. Therefore the significance of the results cannot be linked directly back to the substances themselves, but to the water in addition to the substance added. Future studies could be done with higher concentrations of drugs, with the metabolites of drugs, and with different drugs, licit and illicit.
ContributorsWedel, Sydnee (Author) / Parrott, Jonathan (Thesis director) / Weidner, Lauren (Committee member) / Barrett, The Honors College (Contributor) / School of Mathematical and Natural Sciences (Contributor) / School of Criminology and Criminal Justice (Contributor)
Created2022-05