When faced with the challenge of authenticating counterfeit materials, police hailed black lights as their greatest advantage in catching crooks. We explained that when struck by ultraviolet light, almost every substance glows with a distinct color. In the "Kissing Bandit" case, a robber would mug women at the side of the road, clasp his gloved hand over the mouths, and kiss them on the cheek before leaving. After catching a young man wandering near the Kissing Bandit's territory, police identified him as the robber by shining UV rays on his gloves. The traces of makeup on matched the makeup of his victims, so he was proven guilty.
At the time of this article's publication, black lights were a relatively new police tool. Just fifty detectives worldwide knew how to use one to identify minerals. "Tomorrow, ray-using Sherlocks will be a part of the detective systems throughout the world," we said. "Already, a list of their achievements reads like a page from some scientific Arabian nights."
Read the full story in "Weird Unseen Rays Trap Master Crooks"