One option is to cut out the stained area of the large object. If the object that is stained is not transportable there are different ways that an investigator can collect the sample. When dried blood is found on a larger object that is transportable, an investigator should cover the stained area with paper and tape the paper to the object to avoid contamination. When dried blood is found on a small object the entire object can be sent to the lab after it’s been properly packaged and labeled. Also, due to this fact, samples should not be in any container for more than two hours.ĭried bloodstains can be found on small objects, larger objects and on clothing. Samples shouldn’t be in plastic containers because if the sample is still damp the moisture from the sample can cause microorganisms that can destroy the evidence. It is important to only place one item per container to avoid contamination and samples should not be placed in plastic containers. ![]() The paper bag or box is then sealed and labeled again. If the sample isn’t completely dry when it needs to be packaged, the sample should be rolled in paper and labeled and then put into either a brown paper bag or a box. If the sample has to be mailed it should be completely air dried before packaging. It is important to get the sample to the laboratory as quickly as possible because after 48 hours the sample might be useless. The sample must first be dried thoroughly at room temperature. Once the sample is collected it must be refrigerated or frozen and brought to the laboratory as quickly as possible. Liquid blood evidence is generally collected from blood pools but can be collected off of clothing as well, using a gauze pad or a sterile cotton cloth. ![]() There are two different types of blood that can be collected at a crime scene: liquid and dried blood. ![]() The collection and preservation of blood stain evidence is important because this evidence can be used to type blood or run DNA analysis.
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