On the note of OpSec, there's an awesome project called USBKill, which probably would've saved Ross Ulbricht from prison.
> USBKill is anti-forensic software distributed via GitHub, written in Python for the BSD, Linux and OS X operating systems. It is designed to serve as a kill switch if the computer on which it is installed should fall under the control of individuals or entities the owner or operator does not wish it to. It is free software, available under the GNU General Public License. [1]