I work on aircraft. We are not allowed to have ANY non engraved tools on our person. Every tool MUST be identified and MUST be checked out and accounted for. Also, no cell phones, hearing aids (with out specific model and serial numbers recorded with program Security). Anything not permanently attached to the airplane (per Engineering drawing) is considered FOD!!! Even a plastic cap on a unused ground stud is a BIG deal. One of my coworkers dropped a 5/16" wrench fixing a bad fastener. He and another mechanic looked for 3 hours trying to find it. Second shift had 6 mechanics and Two RVI folks looking for it, then Third shift had another 6 mechanics and 2 RVI folks looking for it. Then we came back in and 7-8 more mechanics and 3 RVI folks also kept looking for it. Literally 24 hours after the fact, a mechanic was climbing out of the area and heard it go "clink" and found it. Right where everyone (including me) had looked.
RVI=Remote Visual Inspection. They have really cool snake cameras that can get into some VERY small spaces up to 50ft. away in full color and very high definition. We utilize them often to verify a nut/bolt has been installed, or verify a serial number without tearing a bunch of shit apart, or find a tool, nut, bolt, scraper, rag, etc. that you might have dropped.
I once dropped a plastic scraper in a $12 million engine. Not inside of it, but behind a heat shield. 4 guys looked for it and we couldn't find it. Called RVI out and the guy came out with his FM tool (Fuckin Magic Tool) and asked me where I thought it was? I said here is where I dropped it it, so it should be in this area. He looked (with his million dollar snake camera in his hand) and said "You mean THIS plastic scraper?". Yep, he found it with his eyes only.