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Evaluation of ALS Camera Systems in documentation of Fingerprint Evidence

Jiaqi Max Lu, M.S.; Ran Chang, M.S.; Tianyin Yu, M.S.; Henry C. Lee, Ph.D.

Photography

Visual Examination

Photography

Enhancement Methods

PhysicalMethods

ChemicalMethods

LuminescenceMethods

ALS attachable DSLR system Current hand held ALS device with DSLR

ALS attachable DSLR systemCurrent hand held ALS device

with DSLRDominant

Output(nm)Maximum

Light Intensity(mW)

Dominant Output(nm)

Maximum Light

Intensity(mW)Ultra Violet 365

700-1200400 650

Purple 415 N/A N/ABlue 470 450 2000

Green 525 525 730

Equipmenttype

Lightsource

Enhancement Methods

Powder Amino Acid Cyanoacrylate Fuming Blood Reagent

Latent Prints Process with Powder Method

Powder

Powder Silk Black/Clear Glass BottleA. New System B. Traditional System

Powder

Powder Coin Box Galvanic/Colored Glass BottleA. New System B. Traditional System

Powder

Magnetic Powder White/Dark Glass BottleA. New System B. Traditional System

Powder

Powder White/Multi-color Painted CanA. New System B. Traditional System

Powder

Powder Silver Red/Metal Pot LidA. New System B. Traditional System

Powder

Magnetic Powder Regular Black/Clear Plastic BottleA. New System B. Traditional System

Powder

Magnetic Powder Regular Black/Golf BallA. New System B. Traditional System

Powder

Magnetic Powder White/Multi-color Plastic LabelA. New System B. Traditional System

Powder

Magnetic Powder Silver Black/White Plastic BottleA. New System B. Traditional System

Powder

Magnetic Powder Gray/Dark Ceramic BowlA. New System B. Traditional System

Powder

Fluorescent Powder/Glass frameA. New System B. Traditional System

Powder

Fluorescent Powder/Multi-color Metal Soda CanA. New System B. Traditional System

Powder

Sticky Side Wetwop/Tape Sticky SideA. New System B. Traditional System

Powder

Small Particle Reagent Black/Wet GlassA. New System B. Traditional System

Latent Prints Process with Amino Acid Method

Amino Acid

Ninhydrin/Brown PaperA. New System B. Traditional System

Amino Acid

1,2 Idanedione/Thermal PaperA. New System B. Traditional System

Amino Acid

D.F.O/Coated PaperA. New System B. Traditional System

Latent Prints Process with Fuming Method

Fuming

Basic Red 28/Plastic BagA. New System B. Traditional System

Fuming

MBD/Glass BottleA. New System B. Traditional System

Fuming

Rhodamine 6G/Plastic CardA. New System B. Traditional System

Fuming

RAM/Plastic Shotgun ShellA. New System B. Traditional System

Fuming

Ardrox/Wooden FloorA. New System B. Traditional System

Fuming

Ardrox/Metal BoxA. New System B. Traditional System

Fuming

Basic Yellow 40/Ceramic CupA. New System B. Traditional System

Latent Prints Process with Blood Reagent Method

Blood Reagent

Leuco Crystal Violet/TileA. New System B. Traditional System

Blood Reagent

Hungarian Red/Wooden FloorA. New System B. Traditional System

Blood Reagent

Merbromin/Metal Soda CanA. New System B. Traditional System

Blood

Blood/Dark Glass BottleA. New System B. Traditional System

Results

Quality of captured image of evidence

Results

Ease of equipment operation

Results

Manpower requirement for crime scene documentation

Results

Light source illuminating capability

Conclusion

Our results indicate both systems will assist in the recognition and documentation of evidence. For the crime scene search, the external ALS device is more practical, while for documentation, the ALS attached DSLR system has its advantages.

Design for Next Generation

Evidence quality photos direct entry at crime scene

Crime Scene AFIS

New Solution for Energy Issue

D.F.O/Coated Paper1st generation 2nd generation

1st generation 2nd generation1,2 Idanedione/Thermal Paper

Merbromin/Metal Soda Can1st generation 2nd generation

Rhodamine 6G/Plastic Card

1st generation 2nd generation