Terrible idea, but there are examples of it in modern society. Example: Technician with respirator samples gas levels in giant "empty" natural gas tank, gives

Terrible idea, but there are examples of it in modern society. Example: Technician with respirator samples gas levels in giant "empty" natural gas tank, gives OK to welder and steps out of the tank. Welder grabs technician by the arm, escorts him back into the tank and invites him to hang out for a few minutes while he fires up his torch. Technician waves his probe around a few extra times, double checks the display, and crosses his fingers. I'm sure there's plenty of this sort of thing going on in industry today. Still, probably better not to formalize it.