They already have lists
Heck they can fly a drone over your house and inventory every gun you own
Trump_Deplorable, you might want to ease up on the bongwater. /s
You can do amazing things with drones and remote sensors.
However, Detection, classification, and nventory of inanimate objects composed of metal, composites, and wood inside an enclosed structure is not one of them. Lack of a phenomenology with unique and well-defined signatures, transmissivity of the structure, and signal to noise ratio are some of the issues.
If you still are concerned check out Signals Defense, LLC, SD2500 film for your windows and use TVM Building Products Ultra NT SCIF Barrier as a vapor barrier in your walls.
On the other hand you can use a drone with remote sensors to detect the presence of "recreational pharmaceuticals" due to the outgassing of volatile organic compounds with unique and well-defined mass spectrometry / mass chromatogram signatures.