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Comprehensive notes sheet about the basics of forensic science.
Typology: Study notes
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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)