Collin+>+Labs+>+Blood+Analysis

Blood Analysis 12-13-2007 Collin Webb w/ Tyler Mosely

Questions 1. A presumptive test is one that can be done to determine if a specific piece of evidence, usually blood or semen, is in fact what it seems to be.

2. Using a presumptive test helps to narrow down the amount of work you have to do. There's no point in doing a DNA test on barbeque sauce just because it looks like blood. The presumptive tests we conducted were the HemaStix and Luminol tests.

3. The next step is to determine where the blood came from. If the blood came from an animal, there is no point in wasting time and money by analyzing the DNA. However, if the blood is human, then it can be sent in for DNA testing.

4. Contamination may have been one reason, however it may simply be because the tests are only positive if they show immediate results, and we began recording the ones that changed over time.

5. The source of the unknown was the sample aquired from the car. We know this because it is the sample we are trying to determine the origin of.

6. Because we used blue and yellow food coloring, they would mix to form green if the test was successful.