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Evidence collected by a crime scene must be properly preserved.

Almost all crimes scenes include evidence that should be collected for analysis and use in a future prosecution. Using the proper systems to collect the evidence remaining at a crime scene is critically important. Without having utilize of proper techniques, evidence may be lost, overlooked or contaminated. Inside addition, improper collection can direct to the evidence being ruled inadmissible with trial.

Difficulty: Moderate

Things You'll Require

Gloves Tweezers Dusting powder Tape Proof bags Papers bags Boxes Glass slides

1 Secure and preserve the crime scene. Previous to all evidence can be collected, the scene must be secured from additional contamination. Establish any crime scene fringe and allow only essential staff to get into. Photograph the scene before evidence is collected.

2 Put on gloves plus other protecting clothing, if needed, to make sure you don't contaminate the scene, then conduct some systematic search of the area. Collect proof that is susceptible to the elements first. Hair, for example, can be blown away with the wind. Blood, seminal fluid or other liquid evidence furthermore can be lost if never collected quickly.

3 Make use of cotton swabs or gauze to gather bloodstream proof that has never dried. Blood and seminal fluid must be allowed to waterless completely once collected, then rapidly refrigerated. Items containing bloodstream and seminal fluids ought to be transported from documents bags not plastic to keep moisture and bacteria out of forming. Blood that has dried can be collected as is by means of taking the entire area on which it dried or cutting from a piece of the surface.

4 Collect hair, fibers also thread using tweezers. Each piece of proof should in that case be placed individually in any sealed series bag or container.

5 Dust with fingerprints. Specific powder remains used that is adheres to the oil found on human fingers. Once a print is detected it can be "lifted" using any special tape. The tape is then placed on a glass slide, marked and transported on any sealed plastic evidence bag.

6 Select up larger bits of evidence, such as a firearm or apparel, while wearing plastic gloves so that like not to contaminate the evidence. Place each and every bit in a separate marked bag or box.

Tips & Cautions

Every piece of evidence should be carefully marked and handled. Each and every action of the collection procedure must be chronicled so seeing that to preserve the chain about evidence.

School regarding Hull: Crime Scene Preservation Crime-Scene-Investigator: Evidence Collection Rules Discovery Approach: Collecting the Evidene

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