Types of Evidence Lesson PDF

 Dr. Edmond Locard  Known as the Father of Forensics  Established the first forensics laboratory in Lyon, France in 1910  Known for Locard’s Exchange Principle  Locard’s Exchange Principle  States that when a person comes into contact with an object (or another person),...

 Dr. Edmond Locard  Known as the Father of Forensics  Established the first forensics laboratory in Lyon, France in 1910  Known for Locard’s Exchange Principle  Locard’s Exchange Principle  States that when a person comes into contact with an object (or another person), a cross-transfer of physical evidence can occur  The exchanged materials indicate that the two entities were in contact.  This evidence bears a silent witness to the criminal act.  The intensity, duration, and nature of the entities in contact determine the extent of the transfer.  Forensics is built upon this principle.  Cross Suppose transfers this man create committed evidence. a crime and  isEvidence the main suspect in the case. solves crimes. How does Locard’s Exchange Principle apply to the injury on the suspect’s hand? Think Pair & Share 1. Take 60 seconds to list as many pieces of evidence as you can think of that may be “trace” evidence at a crime scene. 2. Compare your evidence with a partner’s evidence. How many did you have in common? 3. Discuss where each piece of evidence may have originated Evidence can be found in many forms. Investigators must be able to classify evidence. All evidence is either circumstantial DIRECT CIRCUMSTANTIAL or direct. All circumstantial evidence can be further classified as either physical or PHYSICALBIOLOGICAL biological. Direct evidence includes firsthand observations  eyewitness accounts  police dashboard  video surveillance  voice recordings Signed ransom note from  signed ransom notes the Jon Benet Ramsey Investigation  reports (toxicology, lab, etc) Circumstantial evidence is indirect evidence that can be used to IMPLY a fact, but not directly prove it.  prints (fingerprints, bite marks, tire prints)  DNA  ballistic evidence  fibers  hair OJ Simpson’s DNA was found on the inside of these gloves that were found  Circumstantial evidence can be further classified:  physical:  all prints physical  bullets evidenc e  weapons  synthetic fibers  biological (derived from a plant/animal/person):  DNA  hair  natural fibers biological evidence  Other ways to classify evidence:  Class - narrows to a group of people/items  shoe prints  blood type  hair (w/o the root)  Individual - narrows to one individual Complete the Types of Evidence worksheet