Sarah+R100-105

Sarah Ramsland 100-105 in order for evidence to be useful, the evidence has to have a match to something else serology: the analysis of the properties and effects of serums, such as blood, semen, saliva, sweat, and fecal matter what happens during a test? - a piece of absorbent paper is treated with a starch fluid - press the paper onto the spot with the saliva - this collects the enzymes - iodine is applied and changes colors if there is saliva, so you can tell whether it is a large amount of saliva or a normal amount

blood composition doesn't change due to heat or time of death, so traces can be found and analyzed for DNA Test for blood: 1) waving a powerful light across every surface to yield a visual inspection 2) chemical reagent: luminol reacts to the hemoglobin in the blood, making it luminescent, but luminol works best in the dark and destroys some of the properties of the blood, it also reacts with bleach and some metals so it can't be used where bleach has been used or on certain metals 3) fluorescein reagent: works like luminol 4) Kastle- Meyer Color Test: phenolphthalein and hydrogen peroxide, cotton swab rubbed on area with suspected blood, drop of phen. applied and drop of hydrogen peroxide, turns pink or red within 15 seconds, but it also turns pink in the presence of potatoes and horseradish