I must shamefully admit that after vaguely watching American tv shows like CSI for last twenty years I was convinced this is already a thing for a long time.

Does it mean you can't see a perfect reflection on a slightly rusted screw?

I would be genuinely shocked if this isn’t already integrated into the US intelligence apparatus, it just may not be commonly used for domestic cases targeting US citizens, or it currently requires parallel construction to justify how they know things they shouldn’t know. This may just be a way to legalize it or integrate a few new data sources.