How To Process A Crime Scene: Different Options And Processes
Homicide investigations are often the most difficult type of criminal investigation to investigate. The investigation from the initial scene up to the time the suspects have been arrested, are often riddled with questions. One of the most challenging aspects of crime scene investigation is the odor left on the actual scene by the criminal either before leaving the scene of the crime or during the arrest. This can make it nearly impossible for an investigator to differentiate one set of prints from another.
One method used to determine if there is human blood based odor on a crime scene is called bead testing. This involves a device which looks like a small beaded necklace which is hooked to a metal stick. When the scene is inspected, the investigator places the end of the stick into the hole and pulls on the string to generate a bead. If the bead comes out clean, the scene is free of blood. If the bead is spotted, then it proves that the sample was not contaminated with blood.
The handling of crime scene samples is extremely important. The first task after processing a crime scene is to remove all evidence from the area in which the crime occurred. This includes clothing, any articles made of paper or fabric and any belongings such as desk or office computers. It is also important to throw away any personal items such as jewelry. Personal items will not decompose as quickly as the other materials and can remain forever stained or discolored.
The next stage is the inspection stage. For a blood or urine stain, this will mean collecting a sample from the scene. This sample is then placed in a cup or dish and brought back to the lab. Special scientific devices called spectrophotometers will determine the concentration of the odor or blood. This information is recorded and compared with the samples taken from the suspect and other police officers.
The next step of processing a crime scene is to identify the materials found in the scene. This is usually done by using an osmosis machine. The machine separates the water, grease, blood and other chemicals present in the odor and any biological matter extracted by the osmosis membrane. The materials are then weighed and documented.
Forensic scientists are able to use the information recorded in these laboratory reports to determine if the level of contamination in the scene was sufficient to cause DNA to be present. DNA is found in living material such as blood or saliva. This is important for processing a crime scene because the DNA will enable the police to positively identify the perpetrators. However, when no DNA is found, the case is still open for review. The goal is to find conclusive answers for crimes as soon as possible.
When processing a scene, it is important to contact experts immediately. Crime scene cleaning companies do not have the time to evaluate the scene or collect samples; in some instances, they may not even have the manpower to do the evaluation. This delays the process and increases the likelihood that law enforcement agencies will be required to hire more employees for processing a crime scene.
It is important to hire the right processing company. This means contacting a company with the appropriate manpower and equipment. A good company will be quick to evaluate a crime scene, collect and document samples, and analyze the samples for quality assurance. Additionally, a good company will work closely with police departments to ensure that they meet stringent standards and regulations.