An issue is the original files are not guaranteed to be trusted. If for instance your were copying files from a flash drive or a network permission, it would se

An issue is the original files are not guaranteed to be trusted. If for instance your were copying files from a flash drive or a network permission, it would seem natural to rescan every file that is copied to a local disk. From there the more the "outside"/"inside" line gets blurry (e.g. what if it was synced from Dropbox ? or data got injected by an arbitrary program etc.), the more it becomes justified to just scan every file moving anywhere. If the goal is indeed to scan files in the first place.