If one has a USB stick, originally from a trusted source and without hacked firmware, but one has used this USB stick with an unsafe system, then can it safely be plugged it into a Tails OS system and be overwritten by cloning Tails onto it?
By "safe", I mean that the system does not get physically comprimised (e.g. altered firmware) and the Tails OS is not modified.
If it's not safe, then what would a potential attack vector be?
Of course one could just throw out the USB stick and buy a new one.
But a variation on this question would be plugging in the used USB in order to copy non-executable files from the unsafe system, and then asking if this is a safe way to transfer files?