The company that I worked for all of my career had very strict safety rules. One of those rules was that anytime you crossed the yellow line on the manufacturing floor you obeyed all safety rules or else were immediately terminated -- no if's and's or but's. The manufacturing area had lathes and milling machines that ranged from small Clausing manually controlled machines up to massive Cincinnati-Milacron CNC milling machines with hundred foot long beds for milling stringers on large transport aircraft. Nobody was allowed close to those machines if wearing long sleeves, wristwatches, rings, bracelets, earrings, long hair, nose-rings or anything else that could get wrapped around a spindle and the person along with it. The rule wasn't arbitrary -- it was there to prevent any recurrence of industrial accidents that had happened here and at other manufacturing plants.