[kregasaurusrex]

Sorry you were on the receiving end of that and had to learn the hard way. We had the dean of the college (large public research university) I was working at the time receive a gift of a bunch of new MBPs as a token of goodwill from a foreign country, and heard in the very next sentence that they would be going straight into a shredder. At the time I thought these brand-new laptops could easily be wiped & repurposed; but now realize it was a potential attack surface that can easily leak info to APT/espionage groups the second it connects to a network.

Less than a year later a story made national headlines that a professor with direct access to classified material had mysteriously disappeared & never disclosed his close ties with their home country. So not only should you be worried about back doors and side doors; but also watch what's going through your front door as well!