Body fluids & BPA

Question 1

What 2 elements are required for proof of crime ?

Answer 1

Actus reus & mens rea

Question 2

Define ‘Actus reus’

Answer 2

guilty act (stabbing someone)

Question 3

Define ‘Mens rea’

Answer 3

guilty mind (why an act occured; intention, recklessness, knowledge)

Question 4

What colour does Kastle-Meyer go if blood is present ?

Answer 4

pink

Question 5

What colour does Leucomalachite green go if blood is present ?

Answer 5

blue/green

Question 6

What products can produce false positives

Answer 6

bleach, potatoes, horse radish (but stains don’t look like blood)

Question 7

Key physical parameters of blood

Answer 7

Viscosity, surface tension, velocity, properties of impact surface

Question 8

define viscosity (relating to blood)

Answer 8

a measure of a fluid’s resistance to a change of shape or fluidity

Question 9

‘Blood is a non-newtonian fluid’ True/False ?

Answer 9

True - viscosity of blood can change

Question 10

Increased temp causes blood viscosity to ….

Answer 10

decrease

Question 11

Increased haemotocrit volume (via RBC) casues blood viscosity to …..

Answer 11

Increase

Question 12

Define surface tension (relating to blood)

Answer 12

The energy between 2 immiscible materials (blood and air)