2. So you have a crime scene… Goal: Attain physical evidence Goal: Attain physical evidence Secure the area Secure the area Record scene Record scene Rough sketch & photography Attention to details! Finish sketch Finish sketch Valuable as can add what photos cannot Notes Notes Systematic search for evidence Systematic search for evidence

8. What is collected & analyzed? Victim’s clothing Victim’s clothing Fingernail scrapings Fingernail scrapings Head & pubic hairs Head & pubic hairs Blood (DNA typing) Blood (DNA typing) Vaginal, anal, oral swabs Vaginal, anal, oral swabs Recovered bullets Recovered bullets Hand swabs Hand swabs All must be properly labeled & handled to prevent contamination Legal ramifications Legal ramifications Chain of Custody- known quantity Chain of Custody- known quantity

9. Types of physical evidence: Blood, semen, saliva DocumentsDrugsExplosivesFibersFingerprints Firearms & ammo GlassHairImpressions Organs and physiological fluids

10. Paint Petroleum products Plastic bags Polymers Powder residues Serial numbers Soil & minerals Tool marks Vehicle lights Vegetative matter (location)

11. Comparison is the key Do the suspect’s specimen match those of the reference specimen? Hair, paint chip, or fiber example Hair, paint chip, or fiber example Individual Characteristics Evidence that can be attributed to one common source w/ high degree of certainty Evidence that can be attributed to one common source w/ high degree of certaintyFingerprints Bullet markings Class Characteristics Evidence that can only be associated with a group (not a single source) Evidence that can only be associated with a group (not a single source) Automobile paint Blood type