Forensics Fingerprinting Flashcards
What is John Dillinger do to alter fingerprints?
He put acid on the tips
Who first studied fingerprints and when?
Dr.Nehemiah
1684
Who first discovered fingerprinting didn’t change with age?
Sir William Herschel
What are the three categories of fingerprints?
Arch, whorl, loop
Who got credit for the 10 print card?
Ivan Vucetich
Where are sweat glands located in your fingers?
In finger pads
In what layer are fingerprints made?
Basal layer in the epidermis
How many deltas in whorls, loops, and arches?
Arch: none
Loop: 1
Whorl: 2
What week during pregnancy do fingerprints form?
8 to 10
What do forensics look for in fingerprints?
Cores and deltas
How do you perform a ridge count?
You count from the center of the core to the edge of the delta
Different types of whorl patterns
- Plain
- Central pocket
- Double loop
- Accidental
Different types of arch patterns
- Tented
2.plain
Different types of loops
- Radical loop opens towards thumb
- Ulnar (opens towards pinky)
What are minutiae?
Ridge characteristics (delta, core island etc.)
What type of evidence are fingerprints?
Impression evidence
Patent fingerprints
Visible prints transported by blood or liquids
Latent Prints
Not visible but made so by dusting with powders or chemicals
Plastic Fingerprints
Indentations left in soft material such as clay or wax
What database stores fingerprints
Automatic Fingerprint Identification or AFIS
What is the most common type of finger print?
Loops
What are skin secretions composed of?
Sebum and lipids
Latent fingerprints: Ninhydrin
Used on paper
Object is dipped or sprayed with chemical and wait 24 hours
Purple prints
cyanoacrylate latent prints
Found on house hold items
Heat sample in vapor tent
White prints
