Yes, electronics give off RF energy. But you’re not going to detect it from New Jersey if it’s in Maryland. You’re going to detect it from mere feet away. If the bad guy is that close to a target, the RF signal is irrelevant anyway. A smart phone without a GPS receiver still gives of RF energy.
‘You’re going to detect it from mere feet away’
Sorry, thats incorrect. I’ve literally seen not just demonstrations of the capabilities in this area, I personally witnessed some of the stuff done during the Walker spy case from inside the facility’s he ‘attacked’ via his son and a techie back then. And that took place in 1980 or so.
We agree to disagree, no big deal.