body fluids 1
- Created by: meganjayne15
- Created on: 02-05-14 20:50
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- Body Fluids
- body fluids and sources of DNA
- blood
- semen
- vaginal fluid
- saliva
- urine, faeces, vomit
- hair
- teeth
- bone
- tissue
- recovery
- identify areas to be examined
- witness directed
- visual examination
- screening tests
- recover for further testing
- low power microscopy
- high power microscopy
- semen or skin cells
- confirmatory testing
- DNA
- identify areas to be examined
- presumptive tests
- identify the nature and location of various body fluids
- non-confirmatory tests used to screen for the presence of a substance
- never state a stain is a particular substance i.e. blood - call it a red/brown sain
- advantages
- offers a reasonably reliable identification for a stain
- quick
- can be carried out at crime scene
- cheap
- sensitive
- indicative of where to take samples from on exhibit for DNA profiling
- disadvantages
- false positives
- blood - vegetables, cleaning fluids
- semen - vaginal fluid
- false negatives
- dilute blood
- semen - heat
- not always human specific
- may be animal blood?
- false positives
- activity level evidence
- body fluids and sources of DNA
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