US scientists have developed a camera that can scan the scene of a crime to find bloodshed without affecting forensic evidence.
Image for illustrative purposes. (Internet source)
Researchers at the University of South Carolina say their first camera sample could give blood stains even if it had faded to only one-quarter. This new invention was posted on NewScientist.com on 12/10.
Currently, blood stains are usually tested through a chemical called luminol . This chemical reacts chemically with the iron element in the blood, so that the blood will glow green light that even in the dark can be seen.
However, luminol is a poison and can cause blood stains to thin and make it difficult to determine the victim's DNA. Determining the DNA and blood stain will help to tell many things in the field investigation.
This new camera can distinguish very well between blood and four different substances. To take a photo of the scene, the camera will beam the infrared (IR) beam and determine the image of the subject after receiving the reflected light bouncing back to the lens. A dedicated filter is placed in front of the camera lens to make the blood stain discolored and visible on the screen.
The developer of this special camera technology, Stephen Morgan, said the different filters could indicate the difference between the surface and any traces.
" With a proper filter, the camera can check both the sweat and the lipids in the fingerprints that the naked eye can not see. Similarly, we can also detect drug traces on the surface or detect explosives efficiently. '