[2015] Shreya Balaji (IMS Grade 7 SFMandell, IMS GRADE 8 SFMandell): Forensic Science

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by WoodbridgeGT
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[2015] Shreya Balaji (IMS Grade 7 SFMandell, IMS GRADE 8 SFMandell): Forensic Science

...There is an average of 5 litres of blood in the human body. But just a few drops can help solve the crime. If there is a blood spatter at a crime scene, investigators can find out ow the victim was hurt. Blood droplets can help find out where the crime happened and how. It can also help find out what weapon was used. Also, it can be sampled to find DNA. So, blood can help solve a crime in many ways.

Testimonial EvidenceTestimonial evidence are oral or written staemnets from people who saw or claimed to have seen an event. Age, race, and the use of drugs may alter a person's memory of an event. Witnessing a crime can be a traumatic experience. This may change a person's point of view. It also depends how long the person saw what happened. Testimonial evidence is very unreliable.

Forensic Science

Types of EvidenceInvestigators can trace the chamical residue from paint chips to find the class of the paint(Ex. Automoblie paint). Glass fragments are analyzed to find their surface features. Then the investigators will use that to find where the galss came from. Explosive substances can e used to find what type of explosive was used. Ammunition can be used to find the type of weapon. Wounds on a victim can be used to find the weapon too.

Impression evidenceInvestigators can use impression evidence in many ways. They can use tire tracks to find out the type of vehicle and match it to a suspect. They can also take shoe prints to find the type of shoes the suspect may have worn. Bite marks may leave saliva which has DNA. Impression evidence is impressive!

Blood Basics


Polygraphs or lie detectors can help an investigator see when a person is lying. When they interrogate someone certain signs will tell them when someone is lying. If the person fidgets a lot, it shows that they are nervous or scared. If the person fails to keep eye contact, they may be guilty. If the person stammers, it can show that they may not be telling the truth. Lie detection is one of the tools used in solving crimes.

Deception and lies

Hair &FibersBy finding hair samples investigators can also find DNA. Then they can find the suspect. Fibers can help trace back to the type of clothing the person may have worn. They can see how the clothing was made and trace it back to the store it was made/bought in. Cross transfers can show contact between two things.

AnthropologyDNA can be found on bones to help find the identity of a victim. The cause of death may also be found by examinig bones. For example, a gunshot wound to the forehead can be clearly recognized. Age, race, and gender can also be found with bones. WIth new technology, we can create a guess of how the person looked with their bone structure. This is unreliable but can also be helpful.


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