Such evidence encountered includes footwear impressions, tyre marks, and markings created by tools and similar instruments. alcohol involves standard blood alcohol levels that a driver is presumed to be driving under the influence.ĭocument evidence: Document examiner will compare handwritings, signatures, and imprints on documents to determine who or what wrote the document, put together torn pieces of paper to determine what an item's originality is, and identify the person who wrote an document by the format and wording.Impression evidence includes any markings produced when one object comes into contact with another, leaving behind some kind of indentation or print. footwear, tire tread, tool shapes are examples.ĭrug and alcohol evidence: materials defined as a controlled substance and the chemicals and equipment used for illegal manufacturing. Impression evidence: imprints that are left by an object onto another surface. the residue will transfer to one's hands after firing a gun. gunshot residue is also useful to help determine if someone fired the weapon recently. these impressions are known as land and groove impressions. the impressions made from the firing of a cartridge can help to identify the type of weapon used in the commission of a crime. Can use paint transfers or paint chip to identify an object that was at the scene.īiological evidence: blood, saliva, skin cells, semenįirearm evidence: Bullet cartridges, rifle barrels. paint transfers are associated with hit and runs, burglaries. Paint evidence: most common type of physical evidence. Might be present at burglaries, murders, hit and run accidents, and other types of crimes. Broken glass might be transferred onto a shoe, victim, car, or suspect. Glass Evidence: may not be obvious evidence at first but can help solve crimes. classified as either natural or synthetic fibers. can be used to identify the person or animal that left the evidence behind which is possible by mitochondrial DNA.įiber evidence: textile fibers to make cloth, carpet, or rope. can be finger, palm, foot, or other areas of the skin. Patent prints: prints that are visible to the naked eye without having to process them.Inked fingerprint: direct impression of an individual's fingers and thumbs taken with fingerprint ink. prints are invisible and require a powder to develop them. prints left on a surface by contact with friction ridges. Latent Fingerprint Evidence: One of the most common types of evidence and the most useful. legends and other data should be added along with measurements. Sketches drawn to scale should be appropriate for the size of the room. For instance one square on the sheet might represent 10 ft. not to scale doesn't have measurements but the area is proportional to the actual measurements. used to show terrain without measurements.įinished sketch: two kinds of finish sketches are to scale and not ot scale. The walls are drawn flat on this sketch as if the room exploded.Įlevation sketches: used to show slopes present at the scene. detailed sketches of smaller areas inside a larger area.Įxploded view sketch: used to illustrate the interrelationships of blood spatter, bullet holes, and trajectories or other patters of significance. Used to compare with other sketches.ĭetailed sketch: contains measurements of all evidence locations, not drawn to scale.īlow up sketch: higher accuracy of measurements for blood splatter, bullet trajectories, or other pattern evidence. Locality layout sketch: illustrates the general area of the crime scene or rough sketch.
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