Comment Re:or it is used as a tool (Score 1) 164
I'm not sure what the previous poster meant; perhaps he was referring to things classified "Confidential," although even that doesn't typically go in the mail. Perhaps he meant data coming in as a result of the execution of warrants, but that stuff is not typically classified; the key thing with proper handling for such materials is demonstrating chain of custody.
Stuff That Matters doesn't go in the mail at all. It goes by courier, where the courier is typically someone employed with the Defense Courier Service, or an active duty military member with a courier card, or a federal agent with appropriate transport authority. Stuff That Really Matters which has to be physically moved from one location to another goes interesting routes, accompanied by many serious guys, who carry serious weapons and are perfectly willing to do what they have to.
I know these things because I used to carry various sorts of classified stuff around on occasion, back when I wore a uniform for a living.