3. #1 Task Determine if there is physical evidence that connects the suspect to the crime.Determine if there is physical evidence that connects the suspect to the crime. Is there evidence that places the suspect at the crime scene? If so...Is there evidence that places the suspect at the crime scene? If so... Is there evidence that shows the suspect actually committed a crime at the crime scene?Is there evidence that shows the suspect actually committed a crime at the crime scene?

4. Approach Take advantage of the fact that there is always some exchange of physical evidence between criminal and the crime sceneTake advantage of the fact that there is always some exchange of physical evidence between criminal and the crime scene Either criminal leaves something at the crime scene that can be connected to him/her...Either criminal leaves something at the crime scene that can be connected to him/her... Or criminal picks up something at the crime scene that connects him/her to the scene.Or criminal picks up something at the crime scene that connects him/her to the scene.

6. Evidence Collection Forensic scientists (also called criminalists) do not normally go into the field to collect evidence except for high profile cases.Forensic scientists (also called criminalists) do not normally go into the field to collect evidence except for high profile cases. They normally train detectives and police officers to perform the task of evidence collection.They normally train detectives and police officers to perform the task of evidence collection.

7. Evidence Examination The physical match is the strongest form of evidence. It is strong because of the certainty of connecting suspect to crime scene. In the court it is more convincing because of the obvious visible match.

9. Evidence Examination If a physical match is not possible, do comparisons. Use equipment that makes comparisons easier.

18. Click on image to see split screen of two casings.

19. Evidence Examination When identification is needed, screen first, then identify.

24. WRITE COLOR

33. Separates (purifies) the different compounds from a mixture. Can give a positive identification or at least a strong indication of a substances identity. Measures the Mass (formula weight/molecular weight) of the substance, which completes the identification.

37. 1) Run a known standard 2) Run a blank 3) Run the unknown For Courtroom Credibility For comparison purposes

39. Documentation is Critical Computer skills are needed Keyboarding skills are needed

66. PCR Thermal Cycler The Polymerase Chain Reaction (PCR) is a technique where a sequence DNA can be amplified (duplicated) a billion fold in just hours. Minute samples of DNA isolated from blood at a crime scene can be used to determine if an individual was actually at the location of the crime.

76. Visualization Techniques

89. Pictures and animations by Ken Costello Pictures and animations by Ken Costello