Bloodstain+Lab

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 * [[image:http://ecrimescenechemistrymiller.wikispaces.com/i/bTL.gif width="8" height="8"]] |||| [[image:http://ecrimescenechemistrymiller.wikispaces.com/i/c.gif width="1" height="1"]] || [[image:http://ecrimescenechemistrymiller.wikispaces.com/i/bTR.gif width="8" height="8"]] ||
 * || [[image:http://s.wikispaces.com/i/edit.png width="128" height="37" caption="Edit This Page" link="http://ecrimescenechemistrymiller.wikispaces.com/page/edit/Bloodstain+Analysis+Lab"]]For your lab report you will need to turn in a paper with: (This should be typed)

1. Title, Date, Your name and the name of your partners Bloodstain Analysis December 16, 2007

2. The names of your lab partners Grayson Jones, Faith Sanford, Dede Bearden

3. Observations from each part of the lab Test One- Kastle-Meyer Reagent: Evidence one does not turn pink Evidence two does not turn pink Evidence three does not turn pink Evidence four turns pink, therefore it could be blood Evidence 5 does not turn pink

Test Two-Hemastix: Evidence one stays yellow Evidence two turns green Evidence three stays yellow Evidence four turns green, therefore it could be blood Evidence five turns green, therefore it could be blood

Test Three- Immunoassay A green line was between the yellow and the blue and there was a line inbetween the human serum and the unknown.

4. Answers to the following questions:

__Questions__ 1. Recall: what is a presumptive test? A presumptive test is a test that is not 100% correct. It can be faulty and does not definitely say if the substance is blood, however, it gives the forensic scientists a better understanding if the substance is blood or not.

2. What are the advantages of using a presumptive test as opposed to a more complicated test. Which parts of your lab are considered presumptive testing? More complicated tests take a lot of time. It is pointless to take a piece of evidence and look for DNA in it, if it is just motor oil, paint, barbecue sauce or ketchup. A presumptive test is quick, although it does not test the scientists definitely if the substance is blood, it gives them a guess. Parts one and two of the lab are presumptive tests.

3. After the sample is confirmed to be blood, what is the next major step in the testing sequence? Which part(s) of your lab relates to this step? After the substance is confirmed to be blood, the forensic scientists must figure out what kind of blood it is. The blood could be human or animal blood. Test three relates to this step, because the scientists are trying to figure out where the blood sample came from.

4. Some of you got positive results for several of the samples using the Kastle-Meyer Color Test. Our luminol test showed that there was only one true blood sample. Explain why you may have gotten positive results for samples that were not in fact blood.

5. In Exercise 3, what is the source of the unknown? How do you know?

6. What was the purpose of using blue and yellow food coloring? The purpose of using yellow and blue food coloring was to show when the two colors fused together. My results at the end of the lab showed that the yellow and blue die formed an area of green. ||