When it comes to collecting evidence from crimes scenes, there is the right way and the wrong way to do it. Police and investigators have to be extremely careful when it comes to collecting evidence, because it’s very easy for it to become contaminated. Certain things have to be collected in certain ways and if not done properly, any evidence or lead that can aid investigators into solving a crime can be lost. Here is how evidence is collected.
The first thing that has to be done at any crime scene is to lock it down so that no one can contaminate the crime scene and mess up or destroy any potential evidence. This includes excessive people or people that shouldn’t be there at all. This is one of the main reasons you see a lot of police tape around an area where police are.
This is one of the things that is important because it’ll help show how the crime scene was found before any evidence was taken and it can also help out with any confusion if something doesn’t add up with an investigation. Video recordings are also made for this purpose. Many times videos and pictures are used in a court of law so that it can further prove or disprove something about a case. This has helped convict or exonerate a potential suspect on many occasions.
Cover Hands and Feet:
This is also done to help prevent crime scene contamination. Many times at crime scenes, investigators find fingerprints and footprints. These have to be collected carefully and compared to any potential suspects which can aid a case dramatically. If any of the fingerprints or footprints are destroyed it can set a case back and make it more difficult to solve. Sometimes feet isn’t covered, but when it isn’t, investigators take great care with how they walk while at the crime scene. This is another reason too many people shouldn’t be there, so it won’t make this more difficult than it has to be.
Certain tools are used in order to collect certain things at a crime scene. These tools help aid investigators into collecting what they need without destroying it, and it also helps them collect it more easily.
Dusting Powder/Brush – For fingerprints, hand prints, or even bare footprints. When it comes to picking up footprints in dirt or snow, investigators use something else along the lines of a material where they can easily turn the prints into a mold. That way it can be lifted up easily as opposed to dusting for regular prints.
Police Tape – To close off the crime scene.
Evidence Bag – To place any objects into for further analysis such as murder weapons etc.
Paper Bag – For evidence that is better protected in paper rather than plastic such as biological material on clothing.
Cotton Swabs – For collecting blood and other biological material for DNA testing and toxicology.
Tweezers – To pick up hairs and other fibers.
Many other tools are used. These are just some of the main ones investigators use.