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Lecture 3

MEDT220 Lecture 3: The Crime Scene

3 Pages

Medical Laboratory Sciences
Course Code
Lehman, Donald C

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MEDT 220: 9/6/17 Wednesday, September 6, 20111:13 AM • The Crime Scene ○ Securing the crime scene § Treat the scene as if the crime is still occurring § Obtain medical attention if needed § Law enforcement agents should never alter the scene § Anyone who enters the crime scene could destroy evidence John Benet Ramsey murder: missing daughter, crime scene not § preserved/searched properly; girl was found in the basement and murderer never found § Documentation □ Crime scene log (who was at the crime scene, started by 1st responder) □ Note taking (done in ink with numbered pages to prevent tampering) □ Evidence log □ Sketch/photos ® Use photo log sheet (each item has a corresponding number to easily show tampering) ® Use scale § Video/audio recordings ○ Physical Evidence § Crime labs "run" on physical evidence § MUST be recognized at crime scene CSIs must be thorough but reflective-can't collect everything § § Common types: □ Body fluids □ Fingerprints □ Hair (only in the root/follicle, not the shaft) □ Drugs □ Weapons □ Impressions (shoe prints) □ Arson and bomb evidence § Trace evidence is evidence found in very small amounts □ Drops of blood for example □ Can be microscopic □ Weapons □ Impressions (shoe prints) □ Arson and bomb evidence § Trace evidence is evidence found in very small amounts □ Drops of blood for example □ Can be microscopic Questioned r unknown sample § □ Don't know who left the material behind § Reference r known sample § Evidence only collected after documentation is complete § Consider collecting entire item if small enough or mobile § Considerations □ Bloodstain pattern evidence (how fast was the murder, what angle, method) □ Trace evidence □ Control or substrate samples ® Important for arson □ Size of the stain □ Wet evidence § Evidence Collection □ Collection "kit" has a large number of tools and packing material ® Flashlight ® Alternate light source (for finding semen and urine) ® Magnifying glass ® Forceps
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