That would be encrypted/compressed and hidden with some type of Trojan to unencrypt it and decompress it X months later as a hidden directory of kiddie porn or the account info to a couple hundred thousand in untaxed income to destroy the owners life.
Seriously, government officials who are clearly caught doing this should get the death penalty. It would behoove even the most innocent and unobtrusive citizen to record the serials of all major hardware components in computers they own as a defense to this type of subversion.
True, govt “forensic” investigators could ruin almost anyone’s life so easily. Very few would have the knowledge, preparation, or resources to fight back.