December 14, 2016

12/10

Turn in Frank Abagnale Essay

Quiz on Fingerprint matching tomorrow

Absent Friday? need to do fingerprint matching worksheets

12/14 Have out Fingerprint Comparison packet - complete up to #8Get a whiteboard and marker for your group

HW: finish Fingerprint Comparison to #12 Quiz tomorrow on fingerprint matching - must know minutiae!

December 14, 2016

Answer on your whiteboard:1. Who identified the 9 different fingerprint patterns?2. What is the difference between an ulnar loop and a radial loop?3. Who developed the 10-card form of identification we still use today?4. How many minutiae are mapped for AFIS?5. What is the difference between IAFIS and SAFIS?6. Minutiae known as a fork is also a.....7. Who was first to use fingerprints in a murder case?

December 14, 2016

- photograph or take with you

-most common at a crime scene-invisible-made visible w/physical & chemical processing

-visible-made with blood, mud, grease, dirt-photograph or take object

-impression left on a soft surface like wax, clay, putty, soap, etc.-photograph or take a mold

-rolled on a 10-card at police station-changing over to scanned prints instead

Latent

Patent

InkedPlastic

(3-D)

p.12

December 14, 2016

latent

December 14, 2016

Cyannoacrylate

-plastic, metal, glass-produces fumes in an enclosed container - sticks to oils in print; reacts with amino acids-white print-don't inhale fumes; wear gloves

a.k.a. superglue-nonporous

December 14, 2016

Ninhydrin

-paper, tissue, clothing-dissolve in acetone and spray material with suspected print - reacts with amino acids-purple print will appear in 24 hrs. -don't inhale or get on skin

porous

December 14, 2016

Dusting-glass, metal, plastic-dust is applied with a camel hair brush - sticks to sweat and oil-lift with tape and put onto a contrasting card-color varies depending on color of surface-only a little is needed!-don't inhale dust

nonporous

Contrast

December 14, 2016

Silver Nitrate

-wood, styrofoam, paper, drywall-spray print and reacts with salt (in sweat) to form a black print under UV light; print is black/brown silver chloride precipitate-avoid skin contact