Presentation on theme: "FS Fall Final Review. Ch 1 and 2 observations and CSI What factors affect our observations? How does the brain process information? How could you become."— Presentation transcript:
Ch 1 and 2 observations and CSI What factors affect our observations? How does the brain process information? How could you become a better eyewitness?
Forensic investigators recognize, document, collect, and organize evidence left at the scene of a crime. Factors that affect observational skills such as emotion, perception and recall,time of day, level of interest, number of people…
Your brain… Filters (what is important, what you notice, your level of interest, who you are with, where you are….) Fills in gaps (you may think you saw it…) Applies previous knowledge (you sort out issues based on what you know)
Fingerprints Alphonse BertillionAlphonse Bertillion –Anthropometry-use of body measurements for identification –Francis Galton-suggested 3 categories-Arches, loops and whorls 1999 – US v. Byron C. Mitchell-case that provided 3 principles of fprint1999 – US v. Byron C. Mitchell-case that provided 3 principles of fprint 1. unique 1. unique 2. unchanging 2. unchanging 3. can be used to ID individuals 3. can be used to ID individuals
Kinds of Crime Scene Prints Patent /Visible prints –Patent /Visible prints – –made by fingers touching a surface after ridges have been in contact with a colored materials (blood, paint, etc.) Plastic Prints –Plastic Prints – –ridge impressions left on a soft material (putty, wax, soap or dust) Latent/invisible prints –Latent/invisible prints – –caused by the transfer of perspiration/oils on finger ridges to the surface of an object
Identify each fingerprint pattern. Right Hand Left Hand Right Hand