In 2006, a teenage girl in the United Kingdom revealed to her mother that her father was molesting her. When her mother refused to believe it, the girl decided to set up a webcam, aimed at her bed, to run all night. At 4:30 am that very night, the camera – which had switched to infrared mode in the dark – caught an arm creeping under the bed covers.
When you look at the human body under infrared light, the deoxygenated blood in veins shows up as black lines, making them more visible. The prominent vein patterns caught on camera allowed forensics expert Sue Black to identify the father as the perpetrator.
“The reason [this case] came to us is that the Metropolitan Police really did not know what else they could do with it. We didn’t know either at the time, because we’d never done anything like it. But we did …