Page 30 - Stained With Suspicion Blood Detection
P. 30
Post-Lab
Questions
1. What did you observe when you tested the 5. What did you learn about correctly processing
positive control card? evidence? Why is this procedure important?
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2. What did you observe when you tested the 6. What did your group conclude about the
negative control card stain on the carpet? Did your test detect the
presence of blood?
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3. What common food items provided a false
positive in the presumptive blood test? 7. Based on your knowledge of the crime(s),
what is your hypothesis about the events
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............................................................................... surrounding the substance on the carpet of
the truck?
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4. Why do police officers perform a presumptive ...............................................................................
test in the field? Based on your experiments, why
is it important to do a confirmatory test later?
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30 THE MYSTERY OF LYLE AND LOUISE
