Crime Lab: Evidence Sheet

1. Chemical Tests: For each test, put a "+" if present, "-" if not present.
   
   

   Description of Sample	Starch Test	Sugar Test	Fat Test	Protein Test

   
   
   
   
2. Blood or ?                             Sketch:
   1. Is it blood?
      
      
      
   2. How do you know?
      
      
      
   3. Can you tell if it's human?
      
      
      
   
   
3. Pet Samples
       Description of item:                 Sketch:
   
   
   
   
   
   
   
   
   
   
   
4. Hair Samples
       Description of hair:                 Sketch:
   
   
   
   
   
   
   
   
   
   
   
5. Misc. Items
       Description of item:                 Sketch:
   
   
   
   
   
   
   
   
   
   
   
6. List of items found from the above tests:
   
   
   
   
   
   
   
   
   
   
   
7. From which two suspects do you want to see the hair samples and fingerprints?
   
   
   
   
   
   
   
8. Suspect # ______ (name of suspect: __________________________)
   1. Hair sample --how similar or different from the one you examined from the clue tray?
      
      
      
      
   2. Fingerprints--how similar or different from the one you examined from the clue tray?
   
   
   
   
   
9. Suspect # ______ (name of suspect: __________________________)
   1. Hair sample --how similar or different from the one you examined from the clue tray?
      
      
      
      
   2. Fingerprints--how similar or different from the one you examined from the clue tray?
   
   
   
   
   
10. Final Report: My clue letter tray is:
    
    We conclude that suspect # ___________ (name _______________________) is the guilty party because ... (list and explain ALL reasons; use another sheet, if necessary)
    
    
    
    
    
    
    
    
    
    
    
    
11. Questions:
    1. Why did you always set up two test tubes for each experiment?
       
       
       
       
    2. What is the purpose of a control?
       
       
       
       
    3. What was the control of the starch test?
       
       
       
       
    4. What was the control of the sugar test?
       
       
       
       
    5. The thing we are testing for is called an experimental variable. What is the experimental variable in the starch test?
       
       
       
       
    6. What is the experimental variable for the sugar test?
       
       
       
       
    7. The tests you performed were qualitative not quantitative. Discuss with your partner what the possible differences would be between these two terms. If need be, use a dictionary. Then write the differences here:
       
       
       
       
    8. Both of these tests, qualitative and quantitative, are valuable for the scientist. Why did we perform qualitative instead of quantitative tests? Think!

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