Wednesday, July 27, 2011

Lesson 2

Fingerprinting

Iodine Fuming Method

Processing...
The product! (It is quite faint though.)

Cyanoacrylate (Superglue) Fuming Method

The first try, which turned out blurred because Chin Ying and I unthinkingly went to plaster the strip against the science lab door while trying to rub it down with ethanol!
Much clearer this time! The top two are my right thumb and index finger respectively. The big fat blob at the bottom belongs to Chin Ying.




Ridges and Pores Activity (using white glue to make an impression of the fingerprint)


Both pictures are impressions of my left thumb. Taken with my phone's camera! I had a hard time adjusting the angle of my phone so that it can "see" down the microscope. About the coolest thing I have seen thus far...



Powder Dusting Method

Powder dusting really takes a bit of skill. My right thumb, positioned on the left. It is quite okay-done, except for an odd little air bubble at the side.

Creating a Database



Lesson 1


Slylock Fox’s Investigation

Culprit: either the bull or the raccoon.

It is the raccoon, because there are bones, banana skin and remnants of vegetables found in the litter. This points to the animal being an omnivore. Since the raccoon is an omnivore and the bull is a herbivore, it must have been the raccoon. 


Awareness Test

I counted only 12 passes, but that was probably because I did not look up in time at the start. However, like many others I failed to see the moonwalking bear. This means that while concentrating on counting the number of passes, I could not divert my attention to other happenings.


Clues Collected


1.     Footwear impressions allow you to match the impression with actual footwear owned by suspect.
2.     Toolmark impressions allow you to match the impression with actual tools owned by suspect.
3.     Paint examination allows you to match a tool to the crime scene, when the tool is found.
4.     Computer composites can help with suspect identification.
5.     Hair analysis enables comparisons with the suspect's hair or with hair found on the suspect's clothing
6.     Document analysis can verify the authenticity of a document and who the author is.
7.     Fingerprint analysis is still the predominant means of establishing positive identification.
8.     Blood stain pattern analysis tells you how a crime was committed.
9.     Blood analysis lets you identify a victim or a suspect, because DNA is unique to each individual.
10.  Wound analysis can help with identifying the murder weapon.
11.  Pathology allows you to establish time of death and compare with suspect's schedule.
12.  Fiber analysis rests on the principle that whenever two individuals are in contact, materials (dust, paint, cloth etc.) are exchanged at a microscopic level.