Technology can help police find painted-over bloodstains
Spattered blood intentionally hidden under layers of paint can be detected with a standard digital camera that’s been tweaked to record infrared light. The approach could become an important tool for cold-case investigators sizing up an old crime scene.
“We hope it gives law enforcement the ability to go on hunches,” says Glenn Porter, an expert in forensic photography at the University of Western Sydney in Australia. Blood is potentially powerful evidence, as it may harbor DNA that could allow a killer or victim to be identified.