Forensic Science Notes, Study notes of Earth science

Comprehensive notes sheet about the basics of forensic science.

Typology: Study notes

2024/2025

Uploaded on 12/03/2025

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Frye standard: court must decide if questioned procedure, technique, and principles are
“generally accepted” by a meaningful segment of the relevant scientific community
Daubert: judges themselves determine if something is admissible
Method vs manner of death: method is exactly how the guy died (ie. stabbing), manner
of death is circumstances of death (ie. suicide)
Class characteristics are characteristics shared by at least one other thing (ie. saying a
wooden block in a set of wooden blocks is made of wood)
Individual characteristics are characteristics unique to one item (ie. one wooden block
has an A on it which no other block in the set has)
3 kinds of “mortises”
Rigor mortis: body muscles stiffen up after death
Livor mortis: settling of blood in lower parts of body after death
Algor mortis: cooling of body to room temperature after death
Lividity
Dependent lividity: blood flows to dependent parts of body just after death and
settles
Fixed lividity: after some time, blood becomes fixed in its location and won’t
move, even if body gets moved
Stages of human decomposition
Fresh: just after death
Bloated: putrefaction
Decay: black putrefaction
Post decay: butyric fermentation
Putrefaction: rotting, butyric fermentation: break down of certain compounds to
produce gas
Autopsy only required for sudden natural/violent death or unexplained death
Suicide is included
Amount of pressure needed to cause asphyxiation:
Jugular veins: 4-5lbs
Carotid arteries: 11lbs
Trachea: 33lbs
Vertebral Arteries: 66lbs
Important medical terminology:
Anterior = front of body
Posterior = back of body
Aorta: larger artery connected to the heart which distributes blood to other
arteries
Artery: thicker walled blood vessels, under pressure, carry blood form heart to
body
Cardiac: heart related
Cerebral: brain related
Cerebrospinal fluid: fluid around brain and spinal cord
Coronary arteries: the blood vessels supplying the heart
Dorsal: towards back of body
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● Frye standard: court must decide if questioned procedure, technique, and principles are “generally accepted” by a meaningful segment of the relevant scientific community ● Daubert: judges themselves determine if something is admissible ● Method vs manner of death: method is exactly how the guy died (ie. stabbing), manner of death is circumstances of death (ie. suicide) ● Class characteristics are characteristics shared by at least one other thing (ie. saying a wooden block in a set of wooden blocks is made of wood) ● Individual characteristics are characteristics unique to one item (ie. one wooden block has an A on it which no other block in the set has) ● 3 kinds of “mortises” ○ Rigor mortis: body muscles stiffen up after death ○ Livor mortis: settling of blood in lower parts of body after death ○ Algor mortis: cooling of body to room temperature after death ● Lividity ○ Dependent lividity: blood flows to dependent parts of body just after death and settles ○ Fixed lividity: after some time, blood becomes fixed in its location and won’t move, even if body gets moved ● Stages of human decomposition ○ Fresh: just after death ○ Bloated: putrefaction ○ Decay: black putrefaction ○ Post decay: butyric fermentation ○ Putrefaction: rotting, butyric fermentation: break down of certain compounds to produce gas ● Autopsy only required for sudden natural/violent death or unexplained death ○ Suicide is included ● Amount of pressure needed to cause asphyxiation: ○ Jugular veins: 4-5lbs ○ Carotid arteries: 11lbs ○ Trachea: 33lbs ○ Vertebral Arteries: 66lbs ● Important medical terminology: ○ Anterior = front of body ○ Posterior = back of body ○ Aorta: larger artery connected to the heart which distributes blood to other arteries ○ Artery: thicker walled blood vessels, under pressure, carry blood form heart to body ○ Cardiac: heart related ○ Cerebral: brain related ○ Cerebrospinal fluid: fluid around brain and spinal cord ○ Coronary arteries: the blood vessels supplying the heart ○ Dorsal: towards back of body

○ Gastric: stomach related ○ Lateral: to side ○ Medial: to middle ○ Midline: center of body from head to feet ○ Peritoneum: heart cavity ○ Pleural: chest cavity about the lungs ○ Pulmonary: relating to the lungs ○ Vein: thin walled blood vessels which take blood to the heart ■ To remember arteries vs veins, A for artery = A for away, arteries go Away from heart ○ Aneurysm: weakening of blood vessel wall with dilation of vessel, often with rupture of vessel casing ○ Arteriosclerosis: “hardening of the arteries” ○ Cerebra-Vascular Attack: A stroke ○ Embolus: a thrombus (clot) which breaks away from where it formed and went elsewhere ○ Hemorrhage: bleeding either outside of body or into a body cavity ○ Infarction: dead tissue in an organ due to insufficient circulation of blood ○ Myocardial Infarction: “Heart Attack” ● 4 things required for a fire are fuel, heat, oxygen, and a chemical reaction ● Conduction: transfer of heat between substances that are in direct contact with each other ● Convection: thermal energy is transferred from hot places to cold places when warmer areas of a liquid or gas rise to cooler areas in the liquid or gas DNA ● 4 main bases: Adenine, thymine, cytosine, guanine ○ Pair A to T, G to C ● Can be found in any sample of the human body: blood, saliva, skin, hair, etc. ● Two types of DNA: nuclear and mitochondrial ○ Nuclear has ~3 billion base pairs, needs STR testing ○ Mitochondrial has ~16,600 base pairs, needs mtDNA testing ● STR = short tandem repeats, small spots on the DNA chain where a particular sequence of bases repeat consecutively ○ What is used for DNA profiling, have no other use ● DNA Amplification: ○ Polymerase Chain Reaction (PCR) makes millions of copies of each STR ○ Each STR is labeled with a fluorescent blue, green, or yellow dye ○ The length of each STR is then measured to determine number of repeats in a process called electrophoresis ● Thermo-cycler: copies DNA ● Gel electrophoresis: sizes DNA fragments ● In the case of simple mixtures of DNA: ○ You can find out whose DNA is in the mix if you ■ Know how many contributors there are

■ Biopsy samples (paraffin embedded tissue) ■ Blood (bone marrow donor program) ■ Pap smear specimen ■ Sperm bank samples ■ Baby teeth ■ Dried umbilical cord ○ Family members ■ Family reference samples include ● Buccal swabs from parents, children, siblings ○ At least 2 family members ● Preferred family members include ○ Both parents ○ All children/spouse ○ All full children ○ Personal item (items taken from where body was found)