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BU Forensics Academy

Case # U572901

Investigator: ____________________

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Briefing Notes

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1. Russian Olympic gymnast - jealousy

2. American Olympic gymnast - revenge

3. Chinese Olympic weight lifter - apprehended running near hotel

4. Hotel security guard - didn’t report for work, access to rooms

5. Spectator - runner up for US Olympic gymnastics team

6. Hotel administrator - feud with team manager

7. Kenyan Olympic runner - running near hotel

8. Hotel resident #1 - had room key, no alibi

9. Hotel resident #2 - had been pestering team for autographs, no alibi

1. Fingerprints from 10 individuals at the crime scene

2. Blood and skin collected from broken glass

3. Suspect outran an Olympic gymnast - should have athletic physiology

The suspects The evidence

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Your assignment

• Determine perp’s blood type and compare to suspects

• Analyze fingerprints found at the crime scene

• Analyze ECG data to learn about suspects’ physical fitness

• DNA fingerprinting of perp’s tissue• Find out whodunit!

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Blood analysis instructions

1. Put on gloves

2. Label each well with sample name (crime scene sample OR red paint)

3. Place 5ul of each sample into the appropriate well

4. Add 5ul of hydrogen peroxide into each well

5. Stir each mixture with a toothpick - change toothpicks between wells to avoid cross-contamination

6. Record results on worksheet on page 6 - bubbles indicate positive result

1. Put on gloves2. Use pre-labeled blood typing slides and place 5ul of blood from appropriate

suspect into EACH of the two wells labeled A and B3. Add 5ul of anti-A serum in the A well4. Add 5ul of anti-B serum in the B well5. Scratch each mixture with a toothpick - change toothpicks between wells to avoid

cross-contamination6. Record results on worksheet on page 7 - clumps indicate a positive result7. Repeat steps 2-6 for each suspect

Part 1: Is it blood? Part 2: Blood type

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Part 1: Is it blood?

Sample ID Observations Catalase (+/-) Blood?

triangle

square

1. Which of these substances is probably blood?

_______________________________________

2. Could it be anything else other than blood? Explain.

_______________________________________

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Agglutination after adding

anti-A serum

Agglutination after adding

anti-B serum

Blood Type

Crime Scene

Victim

Suspect 1

Suspect 2

Suspect 3

Suspect 4

Suspect 5

Suspect 6

Suspect 7

Suspect 8

Suspect 9

Part 2: Blood Type

1. Based on the results, can you EXCLUDE any of the suspects as having left the blood stain found at the crime scene?

_______________________

_______________________

2. Based on the results, which suspect(s) could have left the blood stain at the crime scene?

_______________________

_______________________

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Investigator’s prints1. Rub a pencil on paper to build up graphite2. Roll one target finger over graphite multiple times3. Place scotch tape over ‘dirty’ finger, remove carefully4. Place ‘dirty’ scotch tape in appropriate box below5. Repeat steps 1-4 for each target finger6. Above each print, record whether it contains a whorl, loop, or arch

L Index L Thumb R Thumb R Index

Type

Prints

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Latent prints at crime sceneInstructions1. Compare latent prints to known prints

from suspects found on page 102. For each latent print, identify to

matching known print and label it with the suspect’s number

1. Based on the results, can you EXCLUDE any of the suspects as having left the prints found at the crime scene?

_______________________

2. Based on the results, which suspect(s) could have left the prints at the crime scene?

_______________________

_______________________

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ECG: Recording Heart Rate1. Remove jewelry and wipe inner ankles and wrists with alcohol

2. Attach electrodes: 2 on inner right wrist, 1 on left wrist, 1 on right ankle, 1 on left ankle

3. Attach leads from computer: red to right wrist, black to left wrist, green to right ankle, white to right wrist, brown to left ankle

4. Sit quietly with hands in lap to minimize movement of body and cords

5. Hit “start/record” in upper right corner. Look for PQRST waves on all three channels (click “autoscale” above each channel to zoom in)

6. Data analysis:

1. Click icon from top menu with two blue vertical lines - two vertical lines should appear on screen

2. Drag left blue line to a baseline and right blue line to R peak (highest wave)

3. Record height indicated by V2-V1 for that channel

4. Drag right blue line to S valley (next to R peak) and record V2-V1

5. Repeat 2-4 for Lead 2 (2nd channel) and Lead 3 (3rd channel) R S R - |S|

Lead 1

Lead 2

Lead 3

Heart Rate Angle

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ECG: Determining Angle1. Set a scale for each side of the triangle on page 13. The

scale is based on your numbers from the previous page. The middle line = 0, left and right are positives and negatives. The scale must be the same on both sides of the 0, and on all three sides of the triangle

2. Plot the value from the table on the previous page on its respective side of the triangle. Draw a perpendicular line through the corresponding side of the triangle for that lead. Repeat for all three sides of the triangle.

3. You drew a new triangle. Find the center of your drawn triangle and draw a straight line from the center of the original triangle to your triangle’s center and extend to the outer circle.

4. Estimate the angle of your heart!

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ECG Evidence

Suspect 1

Suspect 2

Suspect 4

Suspect 6 Normal You

GabbyDouglas

Rate 65 66 64 75 70-75 65

Rhythm Normal Normal Normal Arrythmia Normal Normal

Angle -5o -3o -10o 95o 0-90o -8o

Possible

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DNA Fingerprinting1.Gel electrophoresis

completed (3 suspects loaded with DNA from crime scene).

2.Look at gel under UV light to see the bands of DNA fragments.

3.Draw the bands from your gel to compare the profiles of the suspects with the DNA from the crime scene to figure out whodunit!

4.Who did it? __________

Suspect 1 Suspect 2 Suspect 4Crime Scene