Basically they want an MRI to scan the globe.
“charging violently into cupboards” - aside from being a great name for a garage band, this is probably a good idea in some situations...
When DARPA announces anything like this it means they already have it and just want an unclassified means to use it.
Police have body armor, automatic weapons, and armored personnel carriers, what of a few other toys? How long before they have indirect fire capabilities?
How long before being secure in one's papers, property, and effects is completely meaningless?
(Allegations of illegally posessed substances are all they need now to do a 'dynamic' entry, now).
So, what are the countermeasures?
I think Wayne Industries developed something like this a while ago ...
Half the people on Earth don't have these things. Which is their motivation for hating America. For them, spiking insects might be the way to go. Ants could eat some depleted uranium laced food then serve as a microwave reflector as they hunt about. Maybe a spider or camel dung fly could be given some kind of photographic memory.