This seems like an overreaction. We regularly use scanners to detect foreign or hidden objects on people, such as at airport security. It's not out of the question to use such approaches at high level chess where the cost/benefit is worth it.
Airport security is trying to find bombs and knives. Those are potentially orders of magnitudes bigger than the cheating devices we're talking about here.
Airport security won't find my 0.1mm knife, and it's not a problem if they don't.
