1. DEVELOPMENT REVIEW
The type of surface on which a fingerprint is deposited has a lot to do with the type of print that will be deposited on the physical evidence
The use of sequential processing techniques can increase the number of prints found and improve the quality of the prints already developed

2. Fingerprint Reagents and Targets from http://www. ridgesandfurrows

3. Fingerprint Development techniques
Amido Black: Proteins: Blue-black: Also Commassie blue
DFO (1,8-diazafluoren-9-one): Proteins: Fluorescent Red- A more sensitive Ninhydrin analogue
Fluorescence examination: naturally occurring chemicals and contaminants: Fluoresce without treatment with laser sensitive dyes.
Gentian violet or crystal violet: fatty acid: purple color- good on sticky side of adhesive tape-Toxic- Yellow-orange laser light source (578nm): Alternate- Fuchsin- Green excitation (500nm)
Iodine:good on both porous and non porous- fuming
Ninhydrin: porous surfaces like cardboard, wallboard, paper, wood: amino acids: purple color=Ruhemann’s purple. Treatment with Zn chloride and lasers improve sensitivity
Physical Developer: PD, SPD: Sliver based solution : porous surfaces that are wet or have been wet: sweat: gray to black
Powders: smooth non porous: color depends on choice
Silver nitrate: chlorides in prints:
Small particle reagent : SPR: wet surfaces: molybdenum disulfide in detergent: lipids : gray deposit. Non porous surfaces.
Sudan Black: non porous oily or greasy surface: lipids: blue black color
Superglue or cyanoacrylate fuming: non porous surfaces: white. May be dusted with powder or washed with laser sensitive dyes such as Rhodamine G-6
Vacuum metal deposition VMD smooth non porous surfaces: gold or zinc thin film on latent
See

4. AUTOMATED FINGERPRINT INDENTIFICATION SYSTEM
AFIS –The ability to compare a fingerprint found at the crime scent with a criminal fingerprint computer data base
Cold Searches – searching a data base of several million prints against a single latent print in about 10 minutes

5. LATENT PRINTS CHANCE IMPRESSIONS REQUIRE TRANSFER MEDIUM
ENVIRONMENT DEPENDENT

6. Fingerprint Visualization
At the Crime Scene
Dust and Lift (powders; various colors)
Magnabrush (iron filings and powder)
In the Laboratory
Ninhydrin for paper
Superglue in tank (sometimes at scene)
Other (physical developer, etc.)

7. NINHYDRIN EXAMPLE

10. AFIS HIT EXAMPLE

11. FINGERPRINT LAB PART TWO PART ONE TODAY C. Your Inked or pencil Prints
What fingerprint patterns ?
Enlarged print (at least one characteristic)
D. Super Glue
1 item- glass slide
PART ONE TODAY
A. Black Powder
2 different surfaces:
Smooth glass slide and tile
B. Magnetic Powder
2 different surfaces

12. E. Evidence Sample
Everyone will get an item to process for fingerprints using techniques you have learned/ MUST LIFT A PRINT
HOWEVER!!! MUST SWAB BOTTLE FOR SALIVA FIRST (lightly moistened swab)
Allow swab to dry while you work on item
When dry package in envelope
Once swabbed, dry the swab and then place into envelope and fill out the chain of custody
Be sure to take notes on the evidence and sketch on the card.

13. REMINDERS MAKING A LATENT PRINT VISIBLE
Place some powder in lid, not too much, circular sweeping motion, just grazing surface

14. REMINDERS LIFTING A LATENT PRINT ONTO A FINGERPRINT CARD
Fingerprint card glossy side
Don’t forget info on other side!

15. SOURCES Criminalistics/ Chapter 14 / Saferstein
Kendall FG, Rehn BW Rapid Method of Super Glue® Fuming Application for the Development of Latent Fingerprints. Journal of Forensic Science. 28(3)
Lewis, LA. et al Processes involved in the development of latent fingerprints using the cyanoacrylate fuming method. Journal of Forensic Science. 46(2):
California Dept. Justice/ Physical Evidence bulletin-PEB 16-17
International Association of Identification
(IAI)->