Catalyst - 10.26.15 1. What is the name given to the study of fingerprints? A. Dactyloscopy B. Palynology C. Entomology D. Trichology 2. What causes fingerprints to be left behind when we touch things? A. Salt produced by our sweat glands C. Moisture in the atmosphere B. Natural oils in the skin D. Dust on the things we touch 3. Which of the following is NOT one of the 3 basic types of fingerprint patterns? A. Loops B. Whorls C. Arches D. Spirals 4. Which animal is said to have fingerprints virtually indistinguishable from those of human beings? A. Panda B. raccoon C. koala D. lemur 5. Who is generally recognized as being the first person to use fingerprints as a means of identification? A. Alphonse Bertillon C. Dr Henry Faulds B. Sir William Herschel D. Sir Edward Henry

Answers 1. What is the name given to the study of fingerprints? A. Dactyloscopy B. Palynology C. Entomology D. Trichology 2. What causes fingerprints to be left behind when we touch things? A. Salt produced by our sweat glands C. Moisture in the atmosphere B. Natural oils in the skin D. Dust on the things we touch 3. Which of the following is NOT one of the 3 basic types of fingerprint patterns? A. Loops B. Whorls C. Arches D. Spirals 4. Which animal is said to have fingerprints virtually indistinguishable from those of human beings? A. panda B. raccoon C. koala D. lemur 5. Who is generally recognized as being the first person to use fingerprints as a means of identification? A. Alphonse Bertillon C. Dr Henry Faulds B. Sir William Herschel D. Sir Edward Henry He was a government administrator in colonial India and began using fingerprints in July 1858 to identify illiterate prisoners and workers in India.

10.26.15 I will describe the characteristics of Latent Prints

the week. 10.26 - Latent Print Notes Begin ‘Forensics on trial’ 10.27 - Finish ‘Forensics on Trial’ Latent Prints Practice 10.28 - More Latent Prints Project Work time

Prints at the scene. 1.Patent 2.Impressed 3.Latent

Patent Prints - easily spotted - made in blood, ink, or Oil - on surfaces such as glass, wooden door frames or paper

Impressed Prints Also called plastic prints left in soft/pliable surfaces (clay, wet paint, wax…) View/photograph without any processing

Latent Prints - not visible - Formed due to sweat/salt/dirt left behind - expose, photograph, lift - best prints come from smoother and less porous surfaces

Collecting Latent Prints Powder Alternative Light Source (ALS) - wavelength and filter Cyanoacrylate (superglue) Chemical (ninhydrin) https://www.youtube.com/watch?v=FkcSkADVMIM

Superglue technique. Forensics on Trial https://www.youtube.com/watch?v=FkcSkADVMIM Forensics on Trial https://www.youtube.com/watch?v=t7Qxj2OSm50