Crime Scenes

Crime scenes are known to have many other types of leaven most are physical(DNA,fingerprints,Handwriting,photographs and c dish uphing).Trace Evidence can be microscopic most Trace Evidence is small it cant be seen with the human eye.Trace secern is evidence left by an individual at the crime scene it can be either intentional or unintentional.Trace evidence is left by touch and sample would be if you had a really fuzzy sweater and a person brushes up against you,the fibers from your sweater would transfer to that persons clothing . There are several opposite types of Trace Evidence such as fibers,hair,soil,wood,gunshot residue,pollen,chemicals and many other types.Trace Evidence can be circumstantial an example would be if someone was bump off at a house and that persons moms fingerprint was at that the crime scene,and the mom had visited a week ago the fingerprint has a reason to be there. moreover she still could have murdered her child so she will still have to be cleared as a suspect.Edmond Locard, founder of the Institute of Criminalistics at the University of Lyon, France, developed what has become known as Locards Exchange Principle.This states that e precise contact leaves a trace (Trace Evidence). Investigators can potentially link a suspect and a victim to a location through trace evidence. Glass from doors or windows can stick on the soles of shoes.It can be found on clothes,tools,skin and weapons.Different types of supply break and shatter incompatiblely.Glass can to a fault hold fingerprints.Dust and dirt can also fasten where a person has been,where they have worked,where they live and if they have pets.Pollen is also included in this this because it is a type of dirt and dust and can tell investigators if a suspect has been outside and where they have been.Forensic investigators must handle evidence from a crime scene with care so that they do not contaminate any evidence. Investigators have certain way of collecting ballistic evidenc e in order to prevent contamination and assure that it can be a valuable source of data.The truth about how investigators deal with evidence is very far from the Hollywood image that has been created from shows. The accumulation of ballistic evidence can be broken down into collection of firearms, ammunition, and gunpowder deposits. In all cases, an investigators initiative priority is safety.Before a firearm is sent to a laboratory, it must be checked to see there is no chance of an accidentals shot of a weapon. To be safe, in most cases a weapon will be unloaded. Some all important(p) things that investigators note in this process are the weapons safety adjust and the location of fired and unfired ammunition this way, no evidence is lost.Since trace evidence covers a wide variety of stuff, there is similar variety in the examination that is performed. Specialized interrogation may be done outside of the local laboratory at regional or national facilities. The type of test perf ormed and the roam of information provided vary by the type of evidence tested.For example, analysis of a strand of hair may yield information on the race and prevalent health of the donor, while analysis of a paint sample would probably find the manufacturer of the paint .Hair samples are tested primarily by microscopic comparison. Microscopic comparison identifies the shape, color, texture and other visual aspects of the sample.In some cases hair is subjected to DNA analysis. Trace evidence analysts usually have strands to work with.From these strands, fiber testing is done using high-powered comparison microscopes to compare texture and wear in a side-by-side test. Chemical analysis can determine the chemical makeup of the fibers. In the case of synthetic fabric or carpet, this information can be used to trace the product to the manufacturer using standards databases, further enhancing the significant value of the evidence.Glass can have valuable information through fracture marks, lines and casts.Testing for unique characteristics such as color, optical properties and density can determine the type of glass, for example a window pane, vase or glass bottle. Powerful comparison microscopes are used to compare colors, thickness and layer patterns, and luster or to match fragments and tears.Blood SpatterBlood Spatter is another thing that helps get rid of lunatics and murderers. One of the most important compasss of forensic skill is blood spatter analysis. Under the Crime Scene Investigation, analysts gather the information that could eventually lead to a victims killer. Basic and complicated information can be found when analyzing blood.We can learn what kind of weapon was used, the time of death of a victim and other important facts that can help a case. The pattern that the blood gives off give forensic scientists the tools that they need to help solve cases. Investigators can find clues from a murder through a number of different ways. Typically th ey find out how many times an object hits a part of the body.Stains that are on walls and/or ceilings can tell you that a lot of force was used.. A basic bloodstain pattern is known as transfer or contact. These are made when someone walks through a blood difference footsteps or trails. Gunshot spatters are very common in crime scenes, and give off a sort of mist effect.Sources of blood can produce the origins of whatever it is investigators are looking for. If someone was interested in pursuing a career in forensics they would need a strong stomach or hardy exterior. The scenes can be gruesome and this job isnt for everybody. Also work environment involves visiting morgues with hundreds of dead bodies.A quality that is needed in this field is composure. Things do tend to happen so forensics and other technicians have to refrain themselves and get the job done. Critical thinking and problems solving skills are very important when solving cases that deal with quick decision making and the need of good judgment.Every analyst needs to pay attention to detail because they need to placard the small things in order to collect good data.The first record of blood spatter was in 1895. Dr. Eduard Piotrowski of the University of Krakw published a paper name On the formation, form, direction, and spreading of blood stains after blunt trauma to the head.