take a random sampling of the Chinese-made drones that are out there, dissect them down to the transistors and bits to find the spy technology
The problem is that it may not be possible at the moment. Any problem would more likely be in the software or firmware than the transistors, but it’s highly unlikely that the vast majority of these drones have any sort of spying capability, perhaps none of them at this point in time, since you could never make it 100% impossible to detect. Just like with telecom equipment, though, a lot of concern lies in what could be done or enabled by a future malicious software or firmware update if tensions increase between the countries. Over the past few decades China has transitioned from being a relatively minor threat to a full-on adversary. It’s generally not wise to have an adversary’s equipment in thousands of sensitive industrial and infrastructure locations in your country if it is software upgradable and modifyable.