[Underqualified]

They are now using a 15 minute delay to avoid outside communication. Jamming signals is also entirely possible.

[rozab]

The method in this article uses no outside communication or signalling at all

[Underqualified]

But the Moon Ribas example requires outside communication, I'm just saying that it seems possible to prevent using that effectively.

As for electronics, I assume most can be detected ? Maybe implants might pose a problem ?