1. CJ 210 CRIMINAL INVESTIGATON

2. The Investigator Responsibilities and Attributes; Origins and trends

3. Responsibilities of the Investigator Determine whether a crime has been committed. Verify jurisdiction. Discover all facts, collect physical evidence and follow up on clues. Recover stolen property. Identify the perpetrator or eliminate a suspect. Locate and apprehend the perpetrator. Aid the prosecution by providing evidence of guilt that is admissible in court. Testify effectively as a witness in court.

4. The Development of Investigative Methods. Wickersham Commission Hans Gross (father of forensic investigation) Francis Galton (fingerprint science) Paul Ulenhuth (precipitin tests for blood species) Calvin Goddard (comparison microscope) Edmond Locard (first police lab – France) Paul Kirk (criminalistics)

5. Physical Evidence Development, Interpretation & Investigative Value

6. Criminalistics Discipline Wet Chemistry Instrumental Chemistry Firearms & Toolmarks Questioned Documents Fingerprint Photography Lie Detection Voice Spectroscopy

7. Identification v Identity Identification – the classification process by which an entity is placed in a pre defined, limited or restricted class. Identity – established when the physical is linked to the suspect.

8. Role of the Crime Lab Help establish elements of the crime. Link the crime scene to the victim or perpetrator. Reconstruct how the crime was committed. Induce an admission of confession. Protect the innocent. Provide expert testimony in court.

9. Clues that are sources of information Fingerprints Firearms Blood Semen and other biological material ( DNA profiling) Document examinations Trace evidence Glass