Deep dive into trace evidence

what does locards principle state

when you touch something you take evidence but also leave some

what are the 5 sections of locards principle

detect, recognised, revcovered, examined, interpretated

what is trace evidence

proxy data

what is proxy data

data linking people to locations

what does proxy mean

in place of

what can a case not proceed on alone

DNA

what is trace evidence used to do

exhonerate people

what must be considered with trace evidence

background levels

what does inceptive mean

has a crime taken place w

what are some identifications

prints/mark DNA

what does associative mean

did contact occur

what must be considered with trace evidence

nothing is unqiue

what transfer can occur at a scene that can be more obvious

two way transfer

what does absence of evidence not mean

evidence of absence

what is an example of non contact transfer

finding leaves or dust on your perosn

what are the 4 types of transfer

primary secondary tertiary quanterny

what are 2 transfer considerations

nature or material

what are 5 considerations for when looking at nature or material transfer

shedding, substrate, surface area, nature of contact, frequency

what are 10 persistence considerations

• degradation

• temp

• contamination

• emergyency service intervention

• laundering

• activity after

• animals

• microorganisms

• recovery time

• analysis time

what are 6 challenges with trace evidence on scene

• emergyency personnel

• scene tampering

• wrong collection method

• stored wrong

• interpreted wrong

  • too much evidence

what are the 3 challenges with finding trace evidence at a scene

• not found

• found but vaalue ignored

• found and value recognised but not relevant

what are the 2 recovery consideration that involve PPE

gloves, PPE

what are are the 6 recovery considerations that involve method of recovery

• gelatine lifter

• sequential vs zonal tape

• vaccum sweep

• swab

• ESLA

• hinge lifters

what are the other recovery considerations

• trace or whole sample

  • control

what did the sydney declaration define forensic science as

case based research, science based endeavour, studies trace remanats of past activity through detection, recognition, recovery, examination, interpretation and understanding the public

how many principles where there in the sydeny declaration

7

what was the frist principle - locards

activity and presence produce traces that are fundamental vectors of info

what was the second principle - scene investigation

scene investigation is scientific and diagnostic that requires scientific expertise

what was the third principle - case

forensic science is case based and reliant on scientific knowledge, inestigative methodology and logical reasoning

what was the 4th principle - time symmetry

forensic science is an assessment of findings in contect due to time symmetry

what was the 5th principle - uncertainties

forensic science deals with the continuum of uncertainties

what was the 6 th principle - multidimensions

forensic science has multidimensional purposes and contributions

what was the 7th principle - context

forensic science findings require meanings in context