Raspberry Pi as a Backdoor Installer

I actually saw something similar to this in an episode of the Blacklist. While a properly determined opponent/hacker/spy is something you have little defense against, I feel that I need those USB input covers, if only to make me feel psychologically safer (even if it will only add a fraction of a second in terms of delay when it comes to determined insertion, so to speak).

http://gizmodo.com/this-5-device-can-takeover-a-computer-even-if-its-loc-1789062061