Chapter 9 - Crime Scene Inv. - Unit 1- Lesson 5 Flashcards
Grid Search
often used indoors, this is a variation of the strip / line search pattern. Searchers overlap a series of lanes in a cross pattern, making the search more methodical and thorough.
Spiral search
usually used outdoors by one person. The searcher begins at a certain point and walks in increasingly larger circles to the outermost boundary of the search area.
Strip/Line search
usually used outdoors by several people. Divide the search area into lanes. Have one or more people search each lane by moving in both directions, examining all areas.
Zone/Quadrant search
used for vehicle searches, both indoors and outdoors, or a large area. Divide the area into four different sections and search each area using one of the patterns above.
Trace Evidence
is small quantities of material transferred from a victim or suspect to each other.
hair, textile fibers and fabric, rope, feathers, soil, glass, and building materials
Biological evidence
Things that contain DNA like blood, seminal fluid, or saliva
Impression evidence
Fingerprints, tire tracks, shoe prints, footprints, bite marks, tool marks
Patent prints
A foreign substance, like wet paint, blood, grease, ink, or dirt, transfers and makes readily visible patent prints
Plastic prints
a molded or embedded fingerprint that you can easily see, created by
touching an impressionable surface, such as fresh paint, wax, bar of soap, or mud
Latent prints
result from body residues left behind when the friction ridges of the hands or feet make contact with a surface
Elimination prints
allow fingerprint analysts to distinguish between prints belonging to either the victims and witnesses, or the possible suspects. To make this distinction, take fingerprints from anyone who may have been at the crime scene to eliminate their prints from the pool of suspects.
Electronic evidence
can include cell phones, tablets, laptops, and desktops. Media storage can include thumb drives, external drives, removable disks, tapes, digital cameras, and other data storage equipment
Questioned document evidence
Questioned documents need examination to verify that they could be evidence. Questioned documents may also contain latent fingerprints and DNA
Chain of custody
to document everyone who handled the evidence as well as when, why, and what changes, if any, were made to it.