Visited the shop floor of a well-known producer of engine nacelles not long ago, at their final assembly plant where the nacelles are installed on the engines. They had some rather fancy tool cabinets with internal scanners, which meant the assembly workers had to use their electronic badge to "scan out" every single piece of tool they used. When they closed the cabinets up, it would scan the contents and in case a tool was missing, would sound an alarm advising exactly which tool was missing. Until it was located and put back in its correct place, the employee would be unable to badge out from work. They never had a tool go missing after introducing these cabinets.