CSI LAB (FIRST VISIT)
There are 7 pieces of evidence to be analyzed. Click and then drag the evidence to an appropriate station
(when the evidence glows yellow, it means you can analyze that evidence there) and follow the instructions
to complete the analysis.
Process the victim’s blood at the Toxicology Station.
What is a positive control? A sample that purposely contains a certain drug.
Why is each test duplicated? To help ensure no mistakes are made.
What drug is in Marco Williams’ blood? barbiturates
What type of barbiturate was found? Sodium Thiopental
What is another name for this drug? “Truth Serum”
Did Mr. Williams have enough of this drug in his body to kill him? yes no
Process the Bitemark Saliva at the DNA Station
No two individuals have the same exact DNA markers except identical twins
Follow directions to search CODIS and match the DNA profiles. (Drag each of the three possible CODIS
matches to the right area and click on CONFIRM MATCH, so that you can complete the activity.
Was there a match in the CODIS? yes no
What are you going to do next? Collect DNA samples from suspects for comparison.
Process the bitemark Photo at the Light Table.
To measure the bitemark, we use a ABFO No. 2 scale
What is the width of the bitemark? (across from left to right) 4 cm
What is the height of the bitemark? (top to bottom) 3.5 cm
Click on SEE EXAMPLES to determine if this bitemark is human or canine.
What type of bite mark is it? human
Process the notepad at the Light Table
What tool will reveal the indented markings on the notepad? Electrostatic Detection Apparatus (ESDA)
Can more than one layer on a notepad be readable with this technique? yes no
Worksheet created by Susannah M. Comfort - Teacher at Snell Farm Campus School, Bath, NY
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