>when one would simply need a microscope to find them in devices This isn't a true statement, if strictly read--there are many techniques to hide undocumented

>when one would simply need a microscope to find them in devices This isn't a true statement, if strictly read--there are many techniques to hide undocumented components on boards, and covering all of them requires more than just a pass under a SEM. There's a fun talk that goes over a lot of them here: https://www.youtube.com/watch?v=RqQhWitJ1As https://www.youtube.com/watch?v=RqQhWitJ1As