Class Notes (808,754)
Canada (493,378)
FSC239Y5 (430)


3 Pages
Unlock Document

University of Toronto Mississauga
Forensic Science
Hisham Ragab

Impression Evidence—Footwear and Tire Tracks: Footwear Identification: Detection: Visible, latent, lighting, powders, chemistry Collection: Photography, fingerprint tape, dental stone lift, sulfur casts, electrostatic lifters, gel lifters Benefits: - Type - Pattern design - Number of suspect - Connecting to other crime scenes - Sequence of events - Corroborate versions of events 2D: no depth Removal or deposition of material (not significant) 3D: with depth Class characteristics - An intentional or unavoidable characteristic that repeats during the manufacturing - Ex. Tread pattern, type of footwear, size, wear pattern, defects. Individual characteristics - Unique characteristics - Ex. Cuts, chips, tears, foreign objects embedded. - Physical shapes, spatial relations with each other… Conclusions: - Fingerprint id – three conclusions, will match the person - Footwear and tire tracks – more variables that will change the impression. There is a spectrum for the types of conclusions Detection: - Ambient, white, oblique, ALS, laser - Fingerprint powder - Blood reagents, bb, potassium thiocyanate, iodine fuming - Black magnetic powder Photography: 1. Designation number 2. Date 3. Location 4. Initials 5. Badge Physical removal Enhancement - Fingerprint tape on acetate or backing card - Polivinylsiloxane - Gel lifter - Dental stone Electrostatic dust lifter Impressions in Snow: - Temperature - Types of snow Dental stone - Potassium sulfate to speed up Sulfur Photography: 1. Scale in the same plane 2. Lens perpendicular 3. Designation number Fingerprints: 1. Recognize and identify: training 2. Document: photography (perpendicular to surface of evidence), notes and sketches 3. Collect: intact and submitted to lab 4. Conclusion Residue deposited by friction ridges of the human hand If the damage exceeds the dermal papillae (includes a code which will regenerate in the same pattern), there would be no regrowth of fingerprints. Twins do not have identical fingerprints 1880 Dr. Henry Faulds published first paper in Tokyo - Alphonese Bertillon: anthrometric system to identify individuals, 1879 - Sir Frances Galton 1882: Fingerprints are unique and do not change through life. Classification system for fingerprints developed. - Sir Edward Henry: Alternative classification system (used today with mods) - Canada (1904) by Edward F
More Less

Related notes for FSC239Y5

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.