Forensics Final

How many deltas do arches have?

0

How many deltas do loops have?

1

How many deltas do whorls have?

2

Which one is a loop?

Most popular, 65% of the population

Which one is the arch?

The least popular, 5% of the population

Which one is the whorl?

30% of the population, 2nd most popular

Name the 12 minutiae characteristics?

What evidence categories are for fingerprints?

Indirect, physical, individual and trace

What are the 3 ways fingerprints can be left on a surface?

1. Patent (already visible)

2. Latent (not visible need to be picked up by something to see)

3. Plastic Prints

How are latent prints picked up?

With chemical techniques

What are the 5 chemical techniques to pick up latent prints?

1. Iodine fuming

2. Ninhydrin

3. DFO

4. Silver Nitrate

5. Cyanoacrylate Vapor

What evidence is DNA?

Indirect, physical, biological, individual, trace

How is a DNA fingerprint made?

PCR and Gel Electrophoresis

Why is a DNA fingerprint made?

To compare DNA from a crime scene to different individuals

What evidence is blood and blood typing?

Indirect, physical, biological, individual, (class if only blood type), and trace evidence

What is a precipitin test?

Blood typing test

*Remember blood typing is an antibody antigen test

You are doing an amazing job!

What 3 questions do investigators ask if they see red substance?

1. What is the substance/ is it blood

2. Is it human or animal

3. Who does the blood belong to

What tests are done with these questions?

1. What is the substance/ is it blood

2. Is it human or animal

3. Who does the blood belong to

1. What is the substance/ is it blood

Presumptive test (Hemastix, Kastel Meyers, Luminol, Fluorescein)

1. Is it human or animal

Precipitant test (blood typing, Elisa test, antibody/anti human/cat/dog)

1. Who does the blood belong to

DNA Fingerprint

Identify if the blood is high, medium or low velocity and how it could of occured

identify the parent drop, satellites, spike/spines, and the tail

Agglutination means?

The individual has that blood type

What evidence is handwriting?

Indirect, physical and individual

What is a questioned document?

A document we don’t know who wrote

What is an exemplar document?

A document who we can prove who wrote it/prove authorship

What evidence is chromatography?

Indirect, physical and class evidence

*Remember to calculate RF value measure pencil line to where the solution stopped (solvent front). Then measure where the different colors are. Take solvent front calculation and divide it by the individual colors. For example: 32/40, the RF value would be 0.8.

Good job!!!!!

What are 4 ways to detect counterfeit money?

1. Iodine pen test *yellow if real bill / blue if fake bill

2. Hold bill to light to look for watermarks

3. Look for security thread

4. Look for color shifting ink

What is in a criminal profile?

Physical and psychological characteristics