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The presence or absence of how many antigens determines and individual's blood type in the
*Phosphate (found in Semen)
*Only present in the vaginal cavity for 24 hrs.
*Acid Phosphate decreases with time
what chemical substances are on the surface of red blood cells that impart blood type characteristics to the cells?
What immunological assay technique is used to detect the presence of minute quantities of drugs in blood and urine?
what structure is called where genes are positioned on that looks like a thread like body?
Under which circumstances have 2 people been found to have identical fingerprints?
Under no circumstance
What is the minim number of ridge characteristics necessary before 2 fingerprints can be identified as the same?
no min. exists based on experience and knowledge of an expert
What must one permanently do to alter on a fingerprint and produce scars to damage it?
Is it more important to know the value of ridge patterns in determining the uniqueness of a fingerprint or the type and position of ridge characteristics in determine the uniqueness of a fingerprint?
Type and position
What do you know about livescan images of fingerprints? (3)
-eliminated need for ink prints on paper cards.
-Sent to AFIS datavass electronically
-Captured when a subjects fingers and palms are okayed onto a glass plate.
How can an investigator detect latent fingerprints without the use of chemicals or powder?
What is the order of chemical treatment techniques you would do to visualize latent prints? (3)
1. Iodine Fuming
3. Physical developer
Super Glue fuming is good to use on what type of materials? (4)
What is most often used in conjunction with chemically induced fluorescence to visualize latent prints?
high intensity light sources
If you were trying to visualize latent prints? on leather and rough plastic what type of brush or brushes would be best to use?
Fiberglass brush or Camel hair brush
What would an investigator do next after successfully visualizing a latent print on an object?
take a 1 to 1 photo of the print
Fingerprint patterns which contains two or more patterns or a pattern not covered by other categories.
Systems which are designed to place fingerprints into computers so as to allow the comp. to categorize, compare a set of fingerprints.
Fingerprints which must have one or more ridges entering one side of the print, recurving and exiting the same side.
3 fundamental principles of fingerprints (3)
-A fingerprint is an individual characteristic; no two fingerprint posses identical ridge characteristics
-A fingerprint will remain unchanged during an individual's lifetime.
-Fingerprints have general ridge patterns that permit them to be systematically classified
Explain how and why fingerprints are found on objects which have been touched?
Sweat and oil is constantly , secreted on to the surface of finger ridges. When skin comes in contact with a surface, these fluids are left behind the shape of a print.
put powder of the print, blow excess powder off and then place tape over the print, remove tape and place on a white card. (used often on nonporous surfaces such as glass, plastic, or metal.
-spray the area with the spray and then wait 24 hrs.
-ninhydrin reacts with amino acids and yields a purple substance.
-used on porous substances
-place paper with suspected print in a container which iodine crystals- iodine
-fumes are absorbed by sweat and oil left behind and will give and orange-brown outline.
-used on nonporous surface
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