This is another hidden benefit of Apple hardware that people don't readily consider.
Apple hardware is very hard to get in and out quickly, covertly, and without a few red flags being noticeable.
A couple of years (4+ now) ago when I sat in with Apple's instructor led hardware certification labs there were a small team of high tech crime investigators for the Australian Federal Police, and Australian Attorney Generals department attending.
They weren't interesting in passing the test, they had absolutely *no* interest in OS X, and they hated Apple hardware with a passion - why? Because it was damn hard to get in and out to get access to the hard drive. The '06 model iMacs (which at the time, was the current model) caused this guys to be furious with Apple, given you had to rip/tear the heat shield to get to the hard drive.
Being a predominate Apple technician at the time in Canberra, and given my reputation as being half decent I stayed in contact with a few of these departments, and still do to this day.
Even a little under a year ago I was (2010) I was personally requested to attend on-site to an unnamed department, to get a hard drive out and back in. What was normally a 45 minute on-site, turned in a *2 day* on-site as the team I was with (I was heavily supervised) had never worked on an Mac before, the matter was clearly urgent, and after removing every screw, the LCD panel, every cable, photos were taken and I was providing on-site training as to what every step I was taking.
Placing the iMac back to gather took the longest as I was stopped every few moments, asked to leave the room and then asked to come back into the room to continue. I suspect they were comparing the pull-apart photos to how I was placing the machine back together to ensure the machine was being placed together exactly as it was before.
While I never asked questions, a few months later the Australian Federal Police busted one of Australian's largest children pornography rings in Australia. I have the niggling feeling I was somewhat involved in this operation.
Disclaimer: I am now an owner of an Canberra, Australian based Apple Mac managed services business.