L1 Rich: introduction to forensic analysis Flashcards Preview

1st Year sem 2 : Forensic Analysis > L1 Rich: introduction to forensic analysis > Flashcards

Flashcards in L1 Rich: introduction to forensic analysis Deck (24):
1

what are 9 common types of physical evidence?

1. Biological samples
2. Organic substances
3. Explosives, flammable materials
4. Fibres, plastic, rubber, paint
5. Glass, soil, minerals
6. Wood and vegetative matter
7. Documents
8. Marks and impressions
9. Digital information

2

what are the 3 steps of analysing physical evidence?

Recognition
Collection
Analysis

3

what does analysing physical evidence involve ?

Identification and comparison

4

what is identification?

determination of physical or chemical identity of a sample

5

what is comparison?

comparative analysis of a questioned and a control sample

6

what are class characteristics?

associated with a group (class) rather than with a single source.

7

what are individual characteristics?

properties that can be attributed to a common source with a high degree of certainty.

8

whats the limitations of qualitative analysis?

threshold

9

what's the limitation of quantitative analysis?

limits of detection
absolute accuracy
error limits

10

what are some physical characterisations?

• Temperature, mass, density, refractive index
• Physical state
• Microstructure and morphology

11

what are some chemical analysis ?

• Organic vs. Inorganic
• Qualitative vs. Quantitative
• Destructive vs. Non-destructive
• Bulk vs. Trace
• Presumptive vs. Instrumental

12

what are some analytical methods?

• Spectroscopy
• Chromatography • Diffraction
• Microscopy and microspectroscopy

13

Name biological examples ?

semen, blood urine

14

Name organic substances?

car oil and cocain

15

Name explosives and flammable materials ?

Petrol, GSR, RDX, TATP

16

Name fibres, plastic, rubber and paint?

tyres, polyester

17

Name glass, soil and minerals ?

clay, sale , float glass, quartz sand, window glass

18

name wood and vegetative matter?

leaves, algae, pollen

19

Name documents ?

will, cheque, envelope

20

Name marks and impressions?

tool marks eg: crow bar, tyre marks, shoe impressions

21

Digital information

banking, browser history, ip address, passwords

22

Ho many tests were done n the Sarah Payne case?

461 microspectrophotometry tests, 23 IR spectroscopy tests and 128 TLC tests

23

what are spectroscopic methods?

- UV-Visible
- Fluorescence
- Infrared
- Raman
- Atomic emission

24

what are chromatopgraphic methods?

Thin layer chromatography