Originally Posted by Martinis at 8
Because not everyone is an engineer, and therefore they do not understand technology.
As for the pregnant woman, the doctor might have said something. Your metal detectors are probably based on induction, so I'll let Spiff give you the details on that.
M8
You don't have to be an engineer to know that an x-ray machine takes x-rays and a WTMD is just that. I think we all need to take the time to explain to people exactly what we're doing. That would alleviate alot of fear that people have, and make the process a lot less intimidating for some.