[Dave346]

What is the source of this info?

Also, if this is true, why is it so difficult for NEST to find even one of these devices?

[FairOpinion]

RE. the source -- with this kind of info, you don't publicize the names of people you got them from. Can you imagine the panic, if Tenet or Rumsfeld would stand up and announce something like this? There would be a stampeded out of the US, effectively crippling the economy.

Also -- we don't know whether or not NEST found any devices, they wouldn't publicize that either.

If nukes are shielded in lead, you can't pick up the radiation, that's the whole idea of lead shielding.