just an idea for a trap:
the ME drives need to be hidden somewhere really safe, and disconnected from the rest of the network (for example in a mystcraft age or a pocket dimension.
place hoppers on several places on the floor. it's just the system to throw things on the floor and it still gets saved in the network (and it will collect everything else) next step, place some buttons on not so obvious positions and item droppers at the roof. pressing a button releases a uranium nugget above the thief. it'll kill the thief within a few seconds, and you can collect everything he had (that's just fair, he wanted to steal stuff).