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physical evidence any object that can establish that a crime has been committed or can link a crime and its victim or its perpetrator
keep others out and prevent alteration and destruction to crime scene secure the scene in order to
obtain medical assistance, if necessary; arrest the perpetrator; preserve and protect the area; exclude all unauthorized personnel from the scene responsibilities of the first responder
secure the scene first step in processing a crime scene
sketching, photographs, and notetaking three methods for recording a crime scene
note that the objects were moved but do not reintroduce them to the crime scene if objects have been moved or removed from a crime scene, the investigator should
take overview scenes of entire area and adjacent surroundings what areas should be photographed during a crime scene investigation?
rough sketch sketch made at the crime scene, contains an accurate depiction of the dimensions of the scene and shows the location of all objects having a bearing on the case
finished sketch a precise rendering drawn to scale (CAD)
computer aided drafting CAD
detailed description of physical evidence including time of discovery, who discovered it, how it was discovered, who package the evidence, and the disposition of the evidence what info must be included in written notes made at the crime scene?
size, location, actions of suspect/victims at the scene three factors that influence how an investigator conducts a crime scene
chain of custody record of who has handled the evidence
standard/reference sample physical evidence of known origin used for comparison
substrate control uncontaminated surface material close to an area where physical evidence has been disposited
druggist fold method of folding paper to keep fine particles or powders secure
prevent damage and cross-contamination why should evidence be put in separate containers?
point of reference to document size why should a ruler be included in a photo?
body of the crime corpus delicti
mode of operation modus operandi
linkage theory the case can be solved if investigators can establish links between physical evidence and the victim, crime scene, and/or suspect
transfer theory based on Locard's Theory of Exchange, whenever you leave a location, you leave something behind
strip or line search useful in large, outdoor areas
grid method more thorough version of line search
spiral method dangerous; evidence may be destroyed if investigators initially walk to the center to begin search
zone search useful in indoor searches
wheel method used in special situations, not in large areas
link method used in conjunction with wheel method
all evidence found, measurements from 2 fixed points, orientation and direction, labels for representing evidence what should be included in the sketch?
hair, fiber, clothing, blood sample, bullets, hand swabs from shooting victims, fingernail scrapings, oral, anal, and vaginal swabs, organ samples what should be collected from the body?
bloodstained/wet materials what should not be placed in air-tight containers?
GLASS OR METAL OBJECTS what should be put in a rigid container?
porous container body fluids should be stored in
druggist fold trace evidence
nonporous unbreakable container arson evidence
buccal swab swab from inner portion of cheek of crime scene participants
consent is given, evidence is in immediate danger of loss, emergency circumstances exist, someone being lawfully arrested ways to issue a warrantless search
Created by: pace_sauce